Malicious PDF — malware analysis report

Static analysis result for SHA-256 466e37a6db3498fe…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 04:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2232dadbe6392e82400a5376a115e2e SHA-1: a6fc27caf2048d010913d33ee9a057082fda1b6d SHA-256: 466e37a6db3498feaa22f1e6db117caff2bde88ce123726392b69fc52acb31a7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to compromised websites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crewmak.ru/uplcv?utm_term=harry+potter+play+store PDF link annotation
    • http://uni-farm.pl/ckfinder/userfiles/files/7700767042.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/mekagajelexitiwuti.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/86831086968.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161306c3ca62a0---mokadumit.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/28025566649.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/levejetenojofe.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613450a3b0795---suwosululudemodefu.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/74146008699.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/fizopapemexaxinuzof.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/kevazadoloj.pdfIn PDF document text
    • https://yifff.se/userfiles/file/muwogefileluliwedotupubep.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/61649415761.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/toriw.pdfIn PDF document text
    • http://sparkpro.lv/content/file/50973660268.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/26948583034.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6e1100eb---werexixezulotawagokuxob.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/37198432800.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/77402181083.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/zopojososujiz.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/20480541525.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/vejibalidopevibarana.pdfIn PDF document text
    • http://ativn.com/upload/file/jejunofusugero.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/jugomimedo.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/lejafexituga.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/84536642012.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 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_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 10156 bytes
SHA-256: 979b15734c35894372599a7aac3875cbb1cdc413407cbf275dbc0f34e096facb
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 18332 bytes
SHA-256: 658ce1b28e059cad9a90bedcbeee986c8a141d0927863d2a6ab56e3195b67d25
font_02_sfnt_off00012575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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