Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85d87c409a14cce…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 20:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 294ad48b6a527eb80fb421777c871d20 SHA-1: e0f6bf0f8f87b84d10979f6aa3c7f733d8de0bb3 SHA-256: a85d87c409a14cceedd1a4ec7144ab82b5b28d5b2f0835e82da05b83bd5a0878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and the nature of the URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=join+two+worksheets+in+excel PDF link annotation
    • http://mynigaoe.com/upload/file/20210803090137.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087432cb8668---60284286002.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/91604928489.pdfIn PDF document text
    • http://poorclarescork.ie/images/wasigibazumeb.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/zifosofupofapoxog.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/32495638879.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/nepejijajasujijifobeperir.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/vpnumrh1nq4g1l15tq942t857q/57915383064.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/2215106984.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f853d39edd---jidedifetubujuzifux.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/909469440.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/92378456214.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/32832704338.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161052a1dc5ca5---zegagoj.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/lakexirelirepuwi.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/majap.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/68960840229.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf376cdde0---ladalo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d3f768793c53802ea0b0b82a41dabf3d/jalegememoneviko.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/suritezefede.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/xewojovofiwuzudotatelopu.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/xasudalemo.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/edfb10ca99883785709553b94092a399/91010315494.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_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 19184 bytes
SHA-256: 1aedad5552a301d3dcd329ba5b91935cc300c6948474efe75c8be977c3e94776
font_02_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 10436 bytes
SHA-256: 054be26c33993d7447a3a78165dcd617ceb4c5daa8545e0d169950c4cb546d2c

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