Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1d8b4bc54b0bd6…

MALICIOUS

PDF

88.6 KB Created: 2021-09-01 20:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12685a0b705ec2385f19dfbe4585259d SHA-1: 16064b0764a6c6d93b3943045ab9cb45b8b373b0 SHA-256: af1d8b4bc54b0bd61d4b5f9602d7f185fcf15ec350b67bf8699d8e99b7fb50d4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to external PDF files, many hosted on compromised or disposable domains, suggests an attempt to redirect users to malicious content or phishing pages. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the use of compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://acril.ru/ufiles/files/87655213367.pdf In PDF document text
    • https://mkontakt.pl/dat//file/pexarevefenalifos.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/jivumabijodonoraferud.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/jawurexojoganabife.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/24914056323.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/nubawowigojeboworezet.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/xetodegizamipow.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/h9g1dsdhsnebnfh932g19e83m7/88903451770.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/28516982771.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/sufeke.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210705170529.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/62617331897.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740901a12d6---72709522177.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/tutinojezelisatiwanevu.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/guzorewofogofape.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/xobejexetivetowireg.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/69b52d4abb047b153d0745c9d40c90e6/52487957022.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/3430935572.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/09a75def7af881ac86c162adc66db68b/vitusorefajoruloxijawazu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b558bb847788fb054f525319554b937a/zedizapazomemafovide.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8ef3090b5---79099484166.pdfIn PDF document text
    • https://retta-bg.com/userfiles/27392166147.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085313c6c0e5---13910124030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+question+answer+ieltsPDF link annotation
    • 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 PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 10644 bytes
SHA-256: de60b6e2e8a516b558dc7569c36c331e18114cf0f676d843c8895762228c1f74
font_01_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 18048 bytes
SHA-256: 31bf57a1e2778e45a42fc45236a69845f3f6e5d1bb22815f0408fb78b4291536

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