Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf09f1412d34e40…

MALICIOUS

PDF

93.9 KB Created: 2021-07-03 06:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dfe6e4958864ad8502d2a920650554f1 SHA-1: 9d1e7c324e9aaf3962eeb7b51a2426f1c56d8462 SHA-256: bbf09f1412d34e4096e7e7848b1eccd610faae48a556ac06a0ade5f26673ba8a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49d7c8d74273f8415536da72699cf914/befof.pdf In PDF document text
    • http://alexhofford.com/temp/files/file/23763812594.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/128ab41f3be9032228a780228c023da5/nuzas.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/193291983.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/98062820688.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/57606915770.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f24d70d3f---xexuguxaxekex.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/fulegumatakek.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/65343071397.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///74621961731.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd8142eda9---25060353281.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/25328275527.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094281bdcc78---digezopu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe7f1cfcc---48404308438.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/20005995923.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5145223d---25815701533.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/96880159214.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8daae5a7c---33242740484.pdfIn PDF document text
    • https://schmitz.cz/res/file/wadedujuruxeradi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b999771512c---zafegojirulexeretad.pdfIn PDF document text
    • http://tipiland.net/upload/file/31245340362.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/64841962170.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/80591169240.pdfIn PDF document text
    • https://giustofiori.it/file/perebonuni.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec3e74138495afbd08b62411d0fe2dd9/10385375835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+make+heavy+cream+from+powdered+milkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 18280 bytes
SHA-256: 3a4cf3f6b090ec5ecb7b8598d5580a0a52387ae00574c016ced609793e5a50c4
font_01_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000135f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0F 10964 bytes
SHA-256: 5fc2c54c653b72b0858d7a67b6ba38d653b2814b2316512d00173912f322ea5b