Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7923da896062c1…

MALICIOUS

PDF

80.6 KB Created: 2021-08-18 00:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3e061c85a38763cc0aaf6d758afb332 SHA-1: 5fb04d8874ba472b30e643151141ac6aee8f1a2a SHA-256: 3d7923da896062c1f19e470a1a6b6cf4ef2957c27aee8e798fa42d409f065bcc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0859kg8fo1nolpt1g39krog5li/lovedegikoditojobudufori.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abafa08a52d---12170656707.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/87985939269.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gosirozojoj.pdfIn PDF document text
    • https://argumentua.com/i/file/88264622502.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/sotijumakem.pdfIn PDF document text
    • http://changdahk.com/upload/76051603924.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/46045323913.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/19002482482.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/1b8b88997452c74270621ea5998244f7/26977195819.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/50053595106.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/97764078229.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/68787459069.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6141d85d3a---10127825427.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05cb93202d---18234559773.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/vipilete.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f1cbb6e4c48a8119c8b98fdfab2ec53e/fevozuzubal.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6226e8f9bb004be1443c5b255c483ea9/29869959762.pdfIn PDF document text
    • https://bfull.ru/uploads/files/vuzagoxibopowat.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jncvv0ngjua6hq0810amsj2i5u/zijogikaneloguraxase.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/21349269428.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf10be086---rujaz.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/92773905310.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/tozetisiwilebuberemigasi.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0f97d5ed5---javimonopinobon.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/93844988591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bir+trece+contact+numberPDF 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_off0000d736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 17212 bytes
SHA-256: 8bb8b091a865a254b369c2316dd54bfaf082f27ae070f28c0657a0267210f2f3
font_02_sfnt_off00011c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 10472 bytes
SHA-256: 33902fae6597c284b84520bb80552ae28a01f28771b8d057f65a00a41e3fa582