Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfbf6c4af387e1d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 10:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13eef0a6b748f83b01a3d0f65bce3657 SHA-1: c11684b5d213fc525f4b6d3ae8cd34692ce2e06d SHA-256: 6bfbf6c4af387e1d1db38d5768b94fe38b6b48653f1a55c79f10280316f66d13
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to external PDFs hosted on various websites, many of which appear to be compromised or disposable. The primary attack pattern involves luring users with promises of prizes or funds, encouraging them to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.almansori-ye.com/almansorifiles/files/32711764581.pdf
    • http://dostrojar.sk/UserFiles/file/87660555440.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f69aa17b79---laruxubawukenufipo.pdf
    • http://haiannweb.com/uploads/files/53028379657.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ecdebe778---61799333288.pdf
    • http://sdv.sk/userfiles/articles/file/zeliropeti.pdf
    • http://bartuceviri.com/userfiles/file/51623608724.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/mimenuf.pdf
    • http://epwuae.com/userfiles/file/tezamegij.pdf
    • http://bjjiffy.com/upload/33927220212.pdf
    • http://masan315.net/board/imagefile/file/85313116055.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4uidb38n5v6t24tqsr91ubp15k/vujiginunebinamewonumolu.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/fgebs7o4evmiagl7uapnq9tor1/31777746651.pdf
    • http://abwrichmond.com/uploads/files/86967705798.pdf
    • https://pellevah.com/upload/files/tubarifixakijosonor.pdf
    • http://the-bom.kr/upfile/files/rojopazekisabebapumej.pdf
    • https://hoongnau.com/upload/files/63854443705.pdf
    • https://sasalidayanisma.org/uploads/file/46232573595.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vpb2i6e0usd73p89q7du1spjg4/xofevi.pdf
    • http://nuuts.mn/uploads/assets/zarunotiditigev.pdf
    • https://dbmotorbrokers.com/userfiles/file/filikomati.pdf
    • http://nfc.soo.jp/file/56549781794.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137edc8cc921---33711187353.pdf
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/difiwixudukav.pdf
    • https://partnermind.cz/images/files/feduwawarukuveril.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/kuruwuza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=volleyball+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db21.bin
31104c3b144b49c01e1abfb85ed614e2d2bab24e13bc75a67729601b8be764f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 10304 bytes
font_01_sfnt_off0000f225.bin
c2a5981af45fc2e85f3335a5aa167c3df13472607fe2b37e47047458673ce3dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 18788 bytes
font_02_sfnt_off0001234f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 16792 bytes