Malicious PDF — malware analysis report

Static analysis result for SHA-256 426e1a9bc8ab36a4…

MALICIOUS

PDF

153.3 KB Created: 2021-06-28 05:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 053a70b49e7d635b09e3df206d91c959 SHA-1: f76d8b35c900c08dbc55b5e3fba7f85ba41b6951 SHA-256: 426e1a9bc8ab36a4bc99cfde7abd8e90304b4066a4349b5baa062e948565b30b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised upload URLs is a high-confidence indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fdafb5062---20202784289.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/153428ae20ec404957eaccc382bd3ef4/41785581897.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d466aee5e06---ligelavexebi.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/4a367f5638d82497359bf416f3c4dc17/dizopanamufubox.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rpba6akqkh1v5gfldj2n3g6q53/51013843259.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec0719d6e---vapakokurukixeboxejelik.pdf
    • http://hungbuloon.com/media/ftp/file/movitatotewaxovelusu.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/4g09hh9nd6ski6kkrael70s7h8/5116508488.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c7ad56b0f---27237598223.pdf
    • https://balustrady-metalik.pl/files/21619201289.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab108281c91---ratarib.pdf
    • http://servis-hradec.cz/files/file/46836808339.pdf
    • http://alarmy-kamery24.pl/userfiles/file/wudemen.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d648c51917---zivakoketi.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fdaad3318---dunidegumuwutudarev.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f58b44789e---gibuwujijuxubok.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/18764567694.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4665455c12---fawoxafegiririnimaruxiw.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2fc6b8388377bb976d3f31c145616729/88586680133.pdf
    • http://alexlunacoach.com/img/editor/file/vunubamevana.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/b77dpvn0c34hg257866u4uc7eg/powomopuzitevo.pdf
    • http://biosite.ru/images/news/file/89865756870.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1028c98df49c5628956b77455992ac6e/zozejizero.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=lady+lucas+pride+and+prejudice
    • 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_off0001f663.bin
2afcce838865705288f4990ac0233bc892144637884b8b67ac1cd5c1a2c77af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F663 18180 bytes
font_01_sfnt_off0002258c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2258C 16792 bytes
font_02_sfnt_off00023da3.bin
b97086cb253850aea4f17b0e93266ab8a13bf3eee428ba8be3586670b5d3dffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23DA3 10592 bytes

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