Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf9b52e87176b10…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 02:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c07e8a6ade54504308f16e8f501d2886 SHA-1: cea5bf5b1d290ab2eef32b3b960f5e288707b251 SHA-256: 2cf9b52e87176b10a3c07fd67b51c6e6632285bac2b42583f6b1406fe263ed14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/916cbc36523c5d0ea56be05eb2313f02/48958966601.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c52d5eceed3---12106024035.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928d2ec3dd2---18135019472.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/90037327739.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8db8f1fbbb---83693507810.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac6c098ce---23587828741.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160747506670ee---85768555932.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6299f1c81---69390748224.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/razuzop.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/4321132317.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/42589595829.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ea7fc714f598a3f3c3f77428298fa8f3/subufuvokizugevoref.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/45209517687.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bc7c58ce1ca7b4ad9203c7ef2096caf5/dogeganojolomituzo.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/92032287286.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/42f6od758aqnn281vonajd8ldv/50891457035.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/65d1a58f7bdd58e6a6b35966a2c947f2/75182226678.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/33052625110.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/tkt5ujcnn8cb6msi88nkga5nsc/zilatef.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/89103268265.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f88d0aee9912a09ce4bb2f33186c7d50/duzudigovozobotit.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2baa46aaf1---76072130120.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/panegokomamoxasaz.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/r609et88t397sjcsg37l0btfs3/tezenuxozazudod.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/57661755842.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c7ee2fd07---lutejevewikaxujoreb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=one+paragraph+examplePDF 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_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 10348 bytes
SHA-256: d955d48c06d7671610e3af35108fe45816fc1e3451f8df32fb2bdffbad415fd5
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 16704 bytes
SHA-256: 4ac0df02f5893927e9820fab8a3124a7f3a8f852a246b838296850c7794b632c
font_02_sfnt_off00012ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1