Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d104f01a6b08bd6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 20:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd20da6c71b1f0328167fc64c039f5f5 SHA-1: 51bcc0c7597c5fb50df44dbd62984094ef28ed5d SHA-256: 6d104f01a6b08bd691f35b25d5c8c7d0759977841f619071267d7adaed5f682d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites and other disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4aga3qnkj106jc0h9391aobfcu/sukolobivefireguriditagi.pdf In PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/75964724817.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65325b7cc0---mujugajedarumiraxukazaju.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210816204327.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45e009f7d2---10735734854.pdfIn PDF document text
    • https://stopserv.ru/files/file/majokowa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611eff81c5faf---6617371327.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/55513382766.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/modolezape.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/nomopunififaponulanigulid.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d6bbd2eb0448493f96493cf8f648df72/87748075929.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/fazetabibaderufopize.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb43721ee9---37254039755.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/irqj10ck0rkjrkj1j45p8s87dv/17545592957.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fq60n50olapeco6st65hv7ber3/87313274730.pdfIn PDF document text
    • http://naturallymine-chicago.com/clients/867610/File/36595185288.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/joduwuzalasuvoza.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/18535901861.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4913f83248---22421076604.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/dawatosojo.pdfIn PDF document text
    • https://unosms.us/userfiles/file/5797143228.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/64b1o89ndrugq9s9o9s6gk5olh/70258039966.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/84762628863.pdfIn PDF document text
    • https://tonitomov.com/picture/file/94806107822.pdfIn PDF document text
    • http://ruresept.ru/files/file/xezafiwuwijumitiwez.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fe4d0c0841faa00f74b1abc4559fa656/numefas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=student+solution+manual+fundamentals+of+physics+10th+edition+pdfPDF 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_off0000d38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 18156 bytes
SHA-256: ffae8201f182bf9a6bce6b5575d71963932e2a82dd50d51d9054e914f7b2c09b
font_02_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 11248 bytes
SHA-256: fef2c93c96882f5c04fb7abf8bc5b3a755f8e42cb2f00527cf8402198544d56b

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