Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f40b6d8cdaba978…

MALICIOUS

PDF

108.9 KB Created: 2021-07-19 23:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99090472a2327cc5b203ddf32ce7929b SHA-1: e23d5fbdc0ff091aec51a1dd643a124b48748353 SHA-256: 0f40b6d8cdaba9780f21cc3b132c4d476da733a8bae89a013569338a426bf15e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious content or phishing pages, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://agendatourvietnam.com/hinhanh/file/difavisaminuvowoporeguzi.pdf In PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021715186532434.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/16481569250.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc2e60ff0---19400193657.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098583c561ba---53499770759.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/pawunikupebuveronu.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/59801270310.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/71430324197.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/7046121671.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4b27968cfda76176296fcf0abc86faf4/17928983307.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160728cf669897---nixil.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/velagemitokisitomuteg.pdfIn PDF document text
    • http://abnicum.com/files/file/xasabolaxamivojosukevif.pdfIn PDF document text
    • http://premium-h.info/files/files/damujogupaziguta.pdfIn PDF document text
    • http://talleresjpg.es/img/file/32553157123.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u4pm2u746u4phsq4s5ta3s1hl0/dimeloxovikalidinexe.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/menusadetepif.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/29059378307.pdfIn PDF document text
    • https://advik.net/userfiles/file/71062401168.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ba25be8f5350137844cf71eab40f2fd0/sebotevikelepimum.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/lozalebidej.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098b70c6e727---55547232741.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608260ddbea8c---29496194404.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/6736383228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kodaly+hand+signsPDF 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_off000148da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000160ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EC 18164 bytes
SHA-256: 77e5768e49bd79073ec3562e85278e7d63e35852d0314be322448f48b6d4301f
font_02_sfnt_off00018fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA4 10300 bytes
SHA-256: 346b5b83aa379e404f691e6582025dc1a300c5d43f088ab892e4cda8fd718c69

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