Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74ed9fd94343938…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 13:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f4bcb2796adff757391eb033fbe6469 SHA-1: d7034d179ce0223707a59fb3329a45e7c07d7d61 SHA-256: d74ed9fd94343938d029d4adfce1ad692f7ef286c949c5094207f152b959d0af
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://smidgel.ru/uplcv?utm_term=engineering+resume+sample+pdf PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b4f833034---vimakoxejezuvum.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/govebupunepuwiweja.pdfIn PDF document text
    • http://ranchobg.com/img/file/88881849575.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/60963810246.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bomenow.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/tubov.pdfIn PDF document text
    • http://taigesw.com/upload/files/89446263100.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/falusepusoxutar.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/a8iil6fqaa35gevrata0hdqv56/bebavogudez.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/550c423bef075481beb6e2a1325af914/37546184757.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/wofaporutibunajamasux.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d20d067a8---42854856982.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/806083caa05d8c449180962ad68d9dd6/4729434261.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/pinogifobekanix.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6579a97b016f192f4c2964748482995/70043792849.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0054507dbf8aa15aa2ce04be5a60420f/vawizuwizaziwolapu.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/zefafiji.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/dogagugav.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/94274825143.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/11640647160.pdfIn PDF document text
    • http://stroi-sistema.ru/img/19397914275.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9b34faafdd41b9885a4987ae15794eb6/ronofowuduwadavifot.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1a3d5c655b56d0681d1584add92ce494/3298637054.pdfIn PDF document text
    • https://datajournonepal.org/files/lupizor.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/revefatopiwubijine.pdfIn PDF document text
    • 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_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 17396 bytes
SHA-256: 6a57edb981f672bc8879105c7fa4354f6dd199c438c7a59fdba04531cb1f61ac
font_01_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 10708 bytes
SHA-256: e0d171b0cd0f1ec9bbc77f5b217c6bb1a02ac67d2561665868ebce94c31c7dd6