Malicious PDF — malware analysis report

Static analysis result for SHA-256 68754c0532124dfc…

MALICIOUS

PDF

69.3 KB Created: 2021-09-13 11:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1017a34d95b0a87282daf296a9a81d89 SHA-1: e20b630cab1c6031aa0d5c453cc52bf7d0c99d38 SHA-256: 68754c0532124dfc287753fb25c0399a4355dca0056fd98e422ca65edc9042e1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded links pointing to potentially compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent. The numerous embedded URLs, many hosted on disposable domains or compromised CMS uploads, suggest a link farm designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://be-now.pl/userfiles/file/68550434865.pdf In PDF document text
    • http://lpsa.cz/userfiles/file/tuloxasuniserepepotepid.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/20988250225.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/jarixetanafujukenavedodov.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/91064728777.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/fokulegobozat.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130abd928db8---84894154529.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/37429121770.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/xibuwoduga.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/88599628942.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/83035038887.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a916307b4---36039998638.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/liruna.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/zogewirinug.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/1714054788.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/nefigomotetiv.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/1i943f305acli8t36b4joifhm1/fiwip.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0140e2d02---naxulavitofigo.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77868188468.pdfIn PDF document text
    • https://armenia4d.com/contents/files/loruli.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/28123083965.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/ranibomavavuxez.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/53518445419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+gems+clash+of+clans+2020+no+human+verificationPDF 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_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE7 14000 bytes
SHA-256: ef36729d3b19c26068d456bf1eb880365cac2e4161199c378d0145f8fd556a3a
font_02_sfnt_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 11168 bytes
SHA-256: 1b9792e13a9f54ad695b93cad0f5e551a52a0f8470e7842d5e8c0309296fbabf