Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a986815ced3cf0…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 22:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 61909f034e10547b1bfb525c5d7f14f0 SHA-1: 638919f242926cd19111f5704a5f9f3dd7960ae4 SHA-256: f0a986815ced3cf0375bc29626f30bc1cdb2b2a4a84fbc1a339ce4f3242dab0c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-based lure, a common tactic for phishing or malware delivery, as indicated by the 'PDF_IMAGE_LURE' heuristic. It contains numerous links to external sites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://laborke.ru/uplcv?utm_term=android+how+to+copy+contacts+to+sim PDF link annotation
    • http://dezmaster.com/userfiles/file/26417050815.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/23877660558.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/ximevuvij.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afc9cd248a---gigojoligike.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/mibase.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/59727261307.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c6120dbfc517a4a2146b1d18629f6bcb/73940688278.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/sejebiwavojaxemobumonunu.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/13056047272.pdfIn PDF document text
    • http://kaies.net/upfiles/210907192101329215yt838p.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/doresadofuxex.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/sefodumepawoli.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/jilotoxelagi.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/3534490999.pdfIn PDF document text
    • http://tai-group.com/upload/files/vobon.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5d19f8f87cf26bc0a72f01b097bfc864/kuwopeduje.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/25518535230.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/24658205742.pdfIn PDF document text
    • http://boldogelet.hu/media/makasaku.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5096_20210917193234.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/36077347104.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/26424778928.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/48307112104.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/gadenij.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/wusuloxajoboguloma.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_off0000b3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 14428 bytes
SHA-256: cfaefb33c681a13f77667c300b300907e925b4c58001d360cce6e2b281dc965f
font_02_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 10780 bytes
SHA-256: 302be6b7cb39f6fa5e327caf91c602e2dd3d62e8f959e8c207d83e578be6251a

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