Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8ab0c82d8a7666…

MALICIOUS

PDF

86.4 KB Created: 2021-06-25 14:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c4df764cdf416817e413195234db921 SHA-1: f6178f9f41e300e98c8e04f05194783f9b9e5590 SHA-256: 4d8ab0c82d8a766651b8a85c946b8c8a1c401f968f7ceedb8cc9532cb533ab1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristics and URLs suggest a tactic of directing users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://homeopathyhongkong.cn/files/pulogit.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dc2aaeab7---26873796369.pdf
    • http://debden.org/userfiles/file/43870847044.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d2fd78083277a38a41a98935b1f0afa1/62623589076.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/6f5663035d2da9a43410a201e0b5eda8/jozemimoxezavinogimugaw.pdf
    • http://quaint-house.com/695032449.pdf
    • http://angelescare.com/userfiles/file/22586194070.pdf
    • http://bannails.com/fckeditor_userfiles/file/89917599208.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ggsdkua0au55jkdfcu663666v7/gejozujopifif.pdf
    • http://ahlhy.com/uploads/file/031853224005.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf15ffb1f70---43371020834.pdf
    • https://hgb.se/filer/file/mijun.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/28b9096bc370ec01e821d931e68e2eff/42817120687.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/apvnveo62ufo87geubdg0e84b5/76564106434.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/2ume4v84j0tasb1l3hqplmoad6/fuvawofutosisuvozirixi.pdf
    • http://modnyi-buket.ru/uploads/files/pevizapemefevefu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=life+hurts+quotes+in+english
    • 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_off0000f1cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 16792 bytes
font_01_sfnt_off000109e2.bin
7c68e174e7690aad0e5d61ff087fac5c6585046d971b452762cba5c2ed1826c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 10536 bytes
font_02_sfnt_off0001217f.bin
a5c4c104b52d28d0ec293bfdc3773239f78fb5ffeed6dd8d10a267526c8b7bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 16980 bytes

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