Malicious PDF — malware analysis report

Static analysis result for SHA-256 29da232b1b09d4a3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 21:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95ff70e31e1af186a9177cb6a54e3e91 SHA-1: 1a112f383e010a989d7ff3f7dcbbd9f997f0f12d SHA-256: 29da232b1b09d4a3fc4bcc9392710c377a183b60141114cf4542a97c947519f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crewmak.ru/uplcv?utm_term=types+of+bullying+worksheet+pdf PDF link annotation
    • http://adveotec.com/img/file/78095330628.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/siranitoboridubo.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/50857402285.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/kevebij.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fesitaxujopana.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052901002070.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/pinagujeratidebodewilopa.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/guroboni.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vazumowuken.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/99281178534.pdfIn PDF document text
    • https://kristinanamaste.eu/files/33397490306.pdfIn PDF document text
    • https://jurad.eu/files/file/97154923017.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/widafulofukajixon.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c112c5007---xizasuduv.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/sudegimesofa.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7bdacd28c---62971019221.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/sokidogudazaribamopufor.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/58469939066.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836a731a698---wunex.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/af8391cd086918aba44053582403aee0/sivamodu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770b31c4e39---nubuzovowuluroloxaxub.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lemojunugelumitid.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16072b88f3ec2d---zoxudidiso.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/domesusilonukesor.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_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 17564 bytes
SHA-256: b9a8361b0a5cdad48858980bd69c8843b9d1a61f022d26dd28e0ee37773f707b
font_02_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 11108 bytes
SHA-256: acccfae46556786d2c647bd5690fe5ace523c2f2ae8097d6cae251947aa7d7ca

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