Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d621c94720755b9…

MALICIOUS

PDF

93.8 KB Created: 2021-07-19 16:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 754b24823faa94116544515f77414a46 SHA-1: 85b8890b0677d66ec2e49168c47157648e548cf8 SHA-256: 2d621c94720755b9d82bcfce260654f4197dc81ef173be73a8ec4383ffa7ab6e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. These links are likely intended to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae355303b---80037239719.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cbb1d5c974f180fa9f7ea05e87c5bbd7/ropikifitinurugoxixakelo.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f4fc90f8---pimewodaxidiwumuxumob.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1ebccb95aae9e369d2e75c3509618fef/79745074797.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1ec2a6e4bc8e3911652beb23e298d20b/nifolupipizumir.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/84560576975.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/655782b7218efb6479b246f544a8cd67/gatefabuputofub.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/24640767076.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/wixatudumilufotu.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8921ed8dv06plvhrb6sm0lbtl8/dukarakanewebosar.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ce605fbe---67823666976.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f25cc111d---jeruviba.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/nijifapeto.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/cca70604486cf898e1c9914f1a56cace/2847074788.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d62aefe89---84406800095.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f6s2m0ssj9geob9tnnh59lf9l4/vorizavufinamigokevesij.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/26729988160.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/79130999011.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/22487092641.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/texijajixezesarakax.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/jizobaxuwuxinixabutetapit.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/nidigugepujozetubozibeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=private+reserve+pool+cabana+mgm+grandPDF 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_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 11064 bytes
SHA-256: a758a64e7093fbddead09cbb03d695c43cf864c2949e0a10c6775ee0b34b566a
font_02_sfnt_off00013d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D79 17096 bytes
SHA-256: 6ab5cf555bd404bdd243bd330f19fefed449106561105c03a941d6cda058c6ed