Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a335b2a0cda4cc…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 13:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c204693e646eb7925dfb5e0a5c8c1caf SHA-1: 53eb357905ff15997e7eb3a0a764ad72b378ae84 SHA-256: 83a335b2a0cda4ccb4fb2fd8a49ae1e80e7bd660ee4ee0143b5d67fcbe7d4606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baraanduliaptti.org/userfiles/file/visewotosadiveb.pdf In PDF document text
    • http://studiomanzella.com/userfiles/files/tadetuxidek.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/27501906418.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/tivukumonezu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca9e9ceab---sugidikajeredaleluwikesiw.pdfIn PDF document text
    • http://hrudolf.com/userfiles/78125775201.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210906092914_jis4gm.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109151534488678.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/63981197766.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/xipodolaxakojukox.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/jebonaragexikanefosika.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/sibewalawuf.pdfIn PDF document text
    • https://synersys.fr/contenu/file/fosewatukuzela.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7b435dc3---40423105068.pdfIn PDF document text
    • http://dogable.de/userfiles/file/nefozobebupewiteros.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/niguworafudotozijetovi.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/79968711472.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/kotujixapidofe.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b969b055c7d8def1260093eecd43552/numunekofulixeriduzedi.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/39597483709.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/fuminajamazozenoj.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/71301337742.pdfIn PDF document text
    • http://c-six.it/userfiles/files/20599525536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rugby+league+kick+off+positionsPDF 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_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 17208 bytes
SHA-256: f16bbffc40658af5b0c1a8db10a7bf6033f13a61412573b8cc8f06dc85274995
font_02_sfnt_off00012d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 11044 bytes
SHA-256: 0009860b92a54fe215ce7f2d7b4c46164334cbb3b223e1386a29e52a19245bde