Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a754a6c091f2e7d…

MALICIOUS

PDF

89.6 KB Created: 2021-09-02 19:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5825516f3e7391e73a4cb0f3b44dc3da SHA-1: 47a3d46185f63fa5a2b088d5dcde05f6462b50a7 SHA-256: 1a754a6c091f2e7d6338e9bd6d9e0d29b7f9279d98b2b7bdc5c45c9cf6ebfe73
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, not typical user content.

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://mebelihome.ru/upload_picture/16064598169.pdf In PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/potefagedakuvozofu.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/mofewazoxifivo.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/52792669666.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/52487731531.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/runolilutigerumaf.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/zovidefikelimomovuman.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b7e0452a2---53441721451.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/lifemirinusizikosasupar.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/682034e22c2c465812e0abf2fe018000/duwawal.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/cbbrv788l6rmksd7a9dadetn90/94890735825.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/34765956240.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15ca81ce21---kufebapapi.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/75214411345.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5972d6faaad6a2dbe366779943b1be34/96166511928.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/38600584294.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1611d349a3b9c4---godajudofaziz.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/88321455038.pdfIn PDF document text
    • https://ebooksweb.net/files/file/dulatuvodogonirinipo.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/95555350761.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/nefuvegipijasil.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/20013274053.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/xuganadavejemitabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=honeywell+chronotherm+iv+manual+englishPDF 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_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 18404 bytes
SHA-256: 2cbaee1923d44d7e11ac0c996952639e0e8a47eee12f373e70d0bf88a5eac6ca
font_01_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 11036 bytes
SHA-256: 7f4eea2a51d412dc22273622dc1cdf8734ae8cc59d4883c5fcdccc998ddd6c64
font_02_sfnt_off00014053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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