Malicious PDF — malware analysis report

Static analysis result for SHA-256 c337d1e19ad88f4d…

MALICIOUS

PDF

89.3 KB Created: 2021-08-18 18:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a3bd5b61ff9d506bc6c36d5c43b9add SHA-1: 8019f8b68a59e5440763ce78fba4ef74e1e2302f SHA-256: c337d1e19ad88f4dfb25f691f210ff91f95f89f5db4384b34f292cfba683cc81
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing scam, evidenced by the high number of phone numbers and disguised URLs embedded within its content. The heuristic 'SE_TRAVEL_SUPPORT_PHONE_SCAM' strongly suggests a social engineering pretext. The numerous external URIs, many pointing to compromised CMS upload directories, indicate a likely attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Travel-support phone-number stuffing scam critical SE_TRAVEL_SUPPORT_PHONE_SCAM
    Document repeats phone numbers in airline/travel/refund/support language, often across multiple regional phrasings. This matches SEO/support-scam PDFs that impersonate airlines or travel brands and route users to attacker-controlled call centers rather than a normal travel document.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=how+to+set+an+orbit+4+station+timer PDF link annotation
    • https://scavilecis.it/userfiles/file/rolozisibibamipoje.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210721173348.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/70968571213.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/29001433957.pdfIn PDF document text
    • http://synphabase.ch/upload/file/89921024086.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/50094427620.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2daa5dd56a---66563639240.pdfIn PDF document text
    • https://stvorki.ru/files/file/remefe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f511c8dbb---91935368806.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jjala2ntpmob7ds1eqmp5qsr17/89897508873.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aae2341c9---xitixuxasulewizinifatanu.pdfPDF link annotation
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793956ddfd8---67478524248.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9713951711---fonevivax.pdfIn PDF document text
    • http://epsilonsigorta.com/files/22495267193.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/mijosurotilaz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94add4385---tebilavuxidirovekos.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/84783987609.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1719765ff061e4dd939a585a2980ed76/pavututigikolupalurepade.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/xagit.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b697babef26a2f98e166bad610f6a5ce/68992511734.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4f8ec3ac64aad9074ae17dc91547f9e6/fojokuserilusobekisoniw.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/kopasorotimutosu.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/sanepisuvaxurolivomum.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1224f7jr5d2hr0oo6pkd8eeb76/gazegisepuvuxasodadiw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn extracted file (font_00_sfnt_off0000f718.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000f718.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 18052 bytes
SHA-256: cb20c701074659bcadbbf2798a4ec0c6e4dcfcff83a9d15a0cc44edb28bc93bd
font_01_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 10516 bytes
SHA-256: a76a928d0134b10420c4dd21b337ac746811185e425e92b39222d906d8d9909c
font_02_sfnt_off00013ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1