Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cbd460a6f0e9d6…

MALICIOUS

PDF

87.2 KB Created: 2021-07-30 09:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faeb078f1b55d51243c859c90a0db55d SHA-1: e94fa6513df230ae5611733206785e28b88b1ba2 SHA-256: a6cbd460a6f0e9d6272278a5f14f9a7ae0ec4bfa883837eff6443d2ae865012b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://cephedanismani.com/images/pages/file/lajilet.pdf
    • http://alphanaturehk.com/userfiles/file/ruwimafupofelixeberaxaxi.pdf
    • https://wilocom.ro/ckfinder/userfiles/files/solonaxagenep.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/73060013900.pdf
    • https://ludifrance.fr/userfiles/file/mutuzakuwi.pdf
    • https://alianzatours.com/imagenes/file/xutetanexorokexope.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/sqlo96ln3e4ct00c69md9lv6v0/zijew.pdf
    • http://medtravel.pro/images/hand_uploaded/files/77082066946.pdf
    • https://fertilizerproductionprocess.com/d/files/38309077519.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a8fa4a98f---75030238356.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc3f0590d.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/d1dod42p5u4d1cane54kb2e140/ronemudawuzez.pdf
    • https://advance-pack.com/editor_upload/file/metuvuj.pdf
    • http://rialta.ie/userfiles/files/65893152537.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/d3gsd548etbpq13si6d5o14gvn/95085274235.pdf
    • http://mlsconsulting.net/cms/files/File/32101083740.pdf
    • http://akinmedikal.com/uploads/file/91818814653.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917fc34055b---65038479803.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7f0ef6be---18655195506.pdf
    • http://davidhammerstein.org/userfiles/file/21308070843.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0s1tsit7vlssjj5gmjjhg5sp01/44709364165.pdf
    • https://pathakpharma.in/singhania/downloads/file/91792576824.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccaf152dea2---67438166705.pdf
    • http://xn--e42bt3l.net/upfile/files/senaludu.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/97a14b5bffc1e7452c4502f0f3b0b7f6/14861978389.pdf
    • https://langumeistras.lt/i/File/pikugejetixaberif.pdf
    • http://otvorene-srdce.sk/userfiles/file/34161394742.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=formula+para+sacar+el+volumen+de+prisma+triangular
    • 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_off0000e7de.bin
768539287546765e595265a87baf1cdb3ec89b1857799be8c7e77fb46f9b853e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 20220 bytes
font_01_sfnt_off00011b0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 16792 bytes
font_02_sfnt_off00013323.bin
e5abaa0fdd1f2af2fe7ae76041e4734c7bdc65675cfa88142c30ada521ee209e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13323 11000 bytes