Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c0b1323405b131…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 17:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e87dd7cd87fbe61f8e594e758441d94 SHA-1: 0bc111794ca87dccb79a7c2a512610cc78648e87 SHA-256: c7c0b1323405b131e2b2f7a672fca1a194e4b5b0d106b1b48296f0efddc17e88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings point to the document's primary function as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=modern+sociological+theory+francis+abraham+pdf+download PDF link annotation
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/faoqfg16p2iu4m2iacm4utdip3/2741018610.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/97018739773.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608081ad19187---31237908021.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/lixusepumuluzax.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/gisogoxeruwawab.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210823220151_2xo8pc.pdfIn PDF document text
    • http://maytinhgth.com/userfiles/file/sudadenodawejedifek.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0c758c42a---jewupinewisadojixobaje.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4992b958f8---gediputoga.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210629234148.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/043b696805a0a00f5f0bb43fe4407d74/wetesuvifuxogutetakep.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/zewokabijonivigubo.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/bodusabitufediwavabuwido.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/97153987479.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608125961952b---17656879622.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/59a6e9c44618cd3f67e7023f9ba5db56/10774692877.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2b322bf3ab2bbe0a5620eba44addfbd8/25934595683.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/l0ngr1b5aqfhgjm0a70kuoe1hq/wufowo.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/19017900066.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/64591627882.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/91862848544.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/29326499174.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/96109299511.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/vusapamaliwat.pdfIn PDF document text
    • 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_off0000cc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 16996 bytes
SHA-256: f1739136e73e65d50a5214fcf83cf2cafe6fe7711fd3ab45e2871b073c936c65
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 11400 bytes
SHA-256: 0410894e1cc29dc6aa06548352cd395bf828703a82b1a5ddd38f65981c0f8192
font_02_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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