Malicious PDF — malware analysis report

Static analysis result for SHA-256 41679aecce13f7d9…

MALICIOUS

PDF

78.1 KB Created: 2021-06-26 01:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2bd8b9f09903ad38111a399e4f631dff SHA-1: 10dbfb68aa5f88d9216b73dfd68f0c1c24140262 SHA-256: 41679aecce13f7d9937176a062a9035cbd492b6aa8d6072d0bfdcebae1f6fc05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160877a50e933d---69642637863.pdf In PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9f5afc4b---bigagitukidosodolinawud.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/kerikuripisifikuw.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/bivuwirapir.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/35678083427.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/60upmiq3megips1cu5rovu6pi0/rizapijoxaliruxizaduvofa.pdfIn PDF document text
    • http://rld-carbon.ru/file/19248971806.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/6136616726.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081051549041.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lj031egdv580q8c6vatoja82kn/42921190253.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5351296fb9---rapurulovomuz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37b7ef6f9---80229393619.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/vepinibi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3tlm7s33gsikhvvjbpq9nseqf/68164893407.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d96904f7b5---vegolulosomepogun.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/53892812492.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc61a26dbd3---gawuniganesasomefepopoxom.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e7ccd9477---62675339537.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c02f999051---62461339958.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/uon226ctmeesc7ost3o46afc63/23493196150.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/60064576478.pdfIn PDF document text
    • http://goref.ru/files/file/ziwiwe.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb90f63d23---20986244675.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/dnkb0r4907go9tcsou9mmsfmsl/51902404803.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/f04tfkhb10v5vga8k9nj4hr1n3/tofumutomovum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=a+star+is+born+hd+streamingPDF 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_off0000ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 18572 bytes
SHA-256: a42956fed4915c6a59f2ab549a33a12cd7fc82ffeee1bbc762ba6b0626faffc7
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 10772 bytes
SHA-256: e506e90bb59bd4930b2b8e8489ae50f0a761f3ef0e2a6ef55b53df56ad309980