Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1099b250639f42…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 11:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5a8371df078f2210fcb8fe6a243edef SHA-1: e99bfb6b4e710b012905350be1a6c168025a6cac SHA-256: 5a1099b250639f42e6cbd5c60459b2efa8a94e83970e0544abe7f3558cfa42e8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://irlanc.ru/uplcv?utm_term=preposition+for+class+5
    • http://studioagronomoserragiotto.eu/userfiles/files/19597791079.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/dibutixo.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4hepg5o4vtcpb95u5q8rlv6211/tuwigigezagok.pdf
    • http://www.pattyn360.com/upload/forum/files/60973009590.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5d0448347---53633074493.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/35asfk5g9ia7hkgpg138oe0407/46600836156.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160920bf01ba32---42354362941.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/33542d02b557cb248549f0e044e087ff/xisafewazalefixalon.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9ab353999fb4b84d70f7e333cff0d3a3/xininesenawaxomokerer.pdf
    • http://aldo-ins.com/userfiles/file/zemopepa.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c38510932cc---45642386296.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0551a28bd---vexikojijifopufaxim.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/lfq4ear53re0svp5jibucnq14l/94506287366.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c6421ee73978070ac336c4f638de55fe/71007591556.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4207c15dbf---nobepuduropurowi.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6072208d0---76021332761.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/486135673a4fe4e76d794e3bde37bfe0/kolenuwefiweluvoxaj.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4878f5100903aefa603bf8b0ec760ac9/zegujatozademufufu.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1594ae24c07c53c9693fa85e40f6d177/2782250876.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fac9952cb226efc7b93f838b62be4968/kosoxez.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb6756774e---76796610592.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/96230564932.pdf
    • http://verynailscm.com/user_img/file/75014666289.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a745b1958ff---19696573240.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b69lv1t7v6m8lid7gipehkl7l1/77615239353.pdf
    • 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_off0000f3b6.bin
65fd66c37288dea6a20e60e7241e532faa0be1a63ec1f30253a54157e23ac0d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 10608 bytes
font_01_sfnt_off00010c23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 16792 bytes
font_02_sfnt_off00012435.bin
247198489b4adf061afae34107859b83f08ccce8e30be311bc2d60bd6eaed463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 17488 bytes

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