Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcd8121b1d6c1ee…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 03:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4816aab10bddeb61d4f3bc90a8111857 SHA-1: 48d08b1024cdce98f6df4aa2a351214b1de3ca5e SHA-256: 3bcd8121b1d6c1ee8f33cbed22ad31ab99b246ca5d471a2464c79c5b7d0748e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/31h4aak4o5189tfk2fb6ibjqr5/fojapojakunanipoku.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/nhi2nq2k5tesc7cbp2binb9bth/bajegeramedaxedekan.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/3372783255.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5fc5d371---datolelumekefowirutuf.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79a4f2b7f---mawupu.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/ripezujo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098092caca33---mozedala.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/89586147826.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/81348923856.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/3958842082.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc2ea81f3---4725335312.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nezedajupewelenemumed.pdfIn PDF document text
    • http://hotstamping.pl/files/file/pidudobo.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/22928988585.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/60101196221.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/31879462013.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4950ca2edb---36232392571.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/52142660634.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/84809729786.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b8027d8a770b993d55e7caf7e968fa11/56641132706.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mikedijobibilirexopofivo.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/86276173957.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/12576644617.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112d765d33ef---72749741066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=breitling+for+bentley+b05+unitime+manualPDF link annotation
    • 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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 19096 bytes
SHA-256: a782c9241321ed022f48f829330bab22e6069e6a2741ba8e460923cdf39ce5c0
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 11052 bytes
SHA-256: f50354714928cff4779f26c88c5d0e412b4d2f2b361383c73a14573cebef058e
font_02_sfnt_off000121cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1