Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ff7b03f7cd21cf…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 16:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33e05c1b772ee781bc9cb56ae0014a8f SHA-1: d324d557ee1fc98e2523c62653218586b89cbaa4 SHA-256: 11ff7b03f7cd21cfdcab3ad0e0b0ace7bd3ee31d70a45930cd92834ad482c69e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised websites or disposable domains, a common tactic for phishing or distributing further malware. The PDF structure itself is simple, with no executable scripts, but the embedded URLs are the primary threat vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://flapboxes.com/userfiles/files/gerepovagezojamafumikifoj.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfff5381d---mamobufewolurorawog.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ab389e0a6af---6991654607.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/1986008488.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/togulujavutiramimesuse.pdfIn PDF document text
    • http://centrons.com/uploaded/file/190630213960efe9c0a9453.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210604022827.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/goxomemijemetivadakijuba.pdfIn PDF document text
    • http://fitviewer.de/files/file/bowasifimevasuxum.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c749cb0ae7bee46dc038a7fcffb01d46/fesewemutomiv.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/vasovaxulekogutobe.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d671cf8ca9f77755dc4ac1760b6cbc05/60824952692.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/reline.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/93457806691.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f8033f5ce71d25ac7303f97124a020e3/tevelametufuvofoviwak.pdfIn PDF document text
    • https://pmms-online.com/assets/file/topepofa.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/mamex.pdfIn PDF document text
    • https://agatanorek.com/files/file/56535882016.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/vidivomameselofab.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/kivuwizoxibirupagimi.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/i9obp1774a4hk2udhhmgnhe7l0/botamawapododawasa.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/tijudotimazub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=como+juntar+varias+paginas+de+pdf+en+un+solo+archivoPDF 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_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 18164 bytes
SHA-256: b7c442357732bc0ad3303d4590765bc4a1ffe67e299fa92ce9445671e848f3cf
font_02_sfnt_off00012e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 11396 bytes
SHA-256: e4b12b30364f5c1c76a7281a836a94e7592d79b1798cd0f91629657657c3bb8c

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