Malicious PDF — malware analysis report

Static analysis result for SHA-256 3838c6f289581d56…

MALICIOUS

PDF

81.6 KB Created: 2021-06-16 08:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11fe7c8bacb6c8773cd6532559b9bc11 SHA-1: bb033705803a231e6198fbd3876e55f5fea9de26 SHA-256: 3838c6f289581d562e72c914b09277b4c9e8aed03ad45aa032113f2696a08a69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body's reference to 'All i want for christmas is you' is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=all+i+want+for+christmas+is+you+de+mariah+carey
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0781bc64d1c7ed4fce6779bb70c05e02/jiduvogipologuxewar.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8i629aq6q1k63vper3tt10ccbv/zizasezemowumaj.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5917b9e24d---56931605305.pdf
    • http://innova-perila.ru/upload/files/73775199530.pdf
    • https://ludifrance.fr/userfiles/file/wedaduxeseperatas.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701a4b3711c---meriw.pdf
    • http://mywayrtk.info/userfiles/file/28344891521.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eib9t8fsk8fn8altum880tv9p4/fusinagajodaweveku.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609407beaa880---48764420593.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b71f9e61f1f184f63a8d6a96b84076ce/4796811942.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cb92e5b2a418b1083342e1eeb9d77e9e/11120472837.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4b3d58d2cdee092b6a1fa352727d2d1c/libofuligagiworonoxiluxe.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ea40519b---3231074440.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7f50ecf1---80758403530.pdf
    • https://jurad.eu/files/file/36980542320.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c5.bin
beb95ba80d4e14f92b6a09a9c70688b05373474a5e68e8dae874490284ca2990		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5328 bytes
font_01_sfnt_off000102c1.bin
3110eb52bcb6774260987169ec5583b177f9abe5a75dac600c75af03ad5c6d5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 12012 bytes
font_02_sfnt_off00012b0b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 4324 bytes

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