Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab278f6016c69e87…

MALICIOUS

PDF

78.1 KB Created: 2021-09-08 11:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74d4fa971ade140e40cbc6d3773a27ae SHA-1: 2fa3a433c9c41fdff18fd269b5425d2b33c9b593 SHA-256: ab278f6016c69e874e5b13104f21a6f446d3337828a7b48aae9d1f4c4fe3d61b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were extracted, the presence of numerous URLs suggests an attempt to redirect users to malicious or phishing content, aligning with a spearphishing attachment attack pattern.

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 https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160bb906a012df---49139907877.pdf In PDF document text
    • http://feriaalainversa.com/uploaded/files/nuremukexateriretuveki.pdfIn PDF document text
    • http://fullx.net/files/44691884619.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/vuxukupudizugivoji.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/samuwevekilo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/beedebbd1f0b2c938fcea446a10de561/modadovonelalanibunetoj.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2e46210379eba35e93299d42be9570c1/57031128639.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123aefa03d54---54193025960.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lufiwemitatarepepid.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/19260132714.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9c55d0711dc21ebcb956cf9c96396cb2/17996946888.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/raloxofun.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7b9f14568bad5345ec9549ccccf2b87d/gijusujimaxotenizuboveb.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/motogaranokim.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/2267491701.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6b15c253---44653918875.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/17619363766.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210820185804.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/piduvulifigi.pdfIn PDF document text
    • https://alutat.com/data/file/wopidadusesomazej.pdfIn PDF document text
    • http://distributoram.com/files/file/63292024243.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/382f7a6d7bf5ec3b5f7eb5831c18b092/13570160747.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/52cffde8b5d03fb840d408efe871ef38/95953587710.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/fde1c46c99f8f50c3a1f2d14851ceabc/debalafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=surah+al+naba+pdfPDF 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_off0000c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 20992 bytes
SHA-256: 4c79563722d25d8ca193893c1b00e80b164afd5be084a5ffd61801bcb2785fa3
font_01_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10300 bytes
SHA-256: 6b9e9f3986a678632f0e17af2a04e802bc19eb586db96de8794b555354e6d8a7
font_02_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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