Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b5cd67f1e6c86a…

MALICIOUS

PDF

113.2 KB Created: 2021-06-29 04:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec9e660536a6962985d14c47a19bd343 SHA-1: 0a532b2bc072a1be9d84fe9cc6929cf9febc089b SHA-256: a1b5cd67f1e6c86a8ad62c092223e8057b4bbc92e6ec747d1ba6070192f140d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and other disposable domains. These links likely serve as a distribution point for phishing attempts or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=i+found+a+silverfish+in+my+bed
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f972bb9a81---vofafokudosufaladaf.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6812a7203d68f95a5dc666d99c801bee/mojorovamuxoxax.pdf
    • http://poorclarescork.ie/images/32025247668.pdf
    • http://hi-techfiber.com/userfiles/file/panakara.pdf
    • https://balajihighfields.in/userfiles/file/fesefexom.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3559235fcd---84432807656.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f154e0f761---gozejorujaxovudet.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///75390223905.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ed6fdcb65fa3c7fee0590d1d9ea4eeda/49292485165.pdf
    • https://gastriklandsbf.se/UserFiles/files/tuxodusudusenexidok.pdf
    • http://kuresi-kaitori.com/upload/content_pic/files/walabunaverat.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d1e9af1d356d15db4c13c1248bcac211/63521141140.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4a5d9a2d22e10b081f597e0a2a8d1584/27811712663.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/fhcepikp83ckk06pqjmt9pp8n6/genasu.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b605fb1362c---kudegujawabavafatobabova.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6812fee6---pafer.pdf
    • http://cestovni-postylka.eu/userfiles/file/guzop.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091be9ecbebb---31396381752.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093741cf3015---vilafezoteso.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160828934abea5---1997416706.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7pt0r6nni98us6ovs8bl8c0se4/tonuzaxuwepi.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/l76d7gv2asrqmmchst4oct2881/7845835159.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806514f2fa6---fedukusozenufozujogaf.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_off000158ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x158AC 16792 bytes
font_01_sfnt_off000170c3.bin
ea0b54c47d6f301bf9e6fcd2f74c1de97a84f46e5d22ab6e0703a238e730e113
pdf-font-stream PDF embedded font (sfnt) at offset 0x170C3 10892 bytes
font_02_sfnt_off000189bf.bin
ab791c93e867bb3d47c8fd146e4d8202ed6c71e623eddbfeceb183ce47bb68ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x189BF 17464 bytes