Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa32e020afd121a…

MALICIOUS

PDF

93.6 KB Created: 2021-06-25 17:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae42c3128b6cde87e0451d37e5399901 SHA-1: 0fd7aac5cfc3bf352eae31593461a312ef4a93b3 SHA-256: 9fa32e020afd121a0dcb062aeff0cb2e679e4a924aa3d35e8629b043bca99dca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and functions as a link farm, with numerous URLs pointing to potentially compromised websites. These links likely serve to redirect users to phishing pages or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=high+fat+low+carb+diet+macros
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/044089906fadbf4f8a3df6322c8126ba/26167781723.pdf
    • http://myphammonly.com/luutru/files/50020542599.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/abc6f4b3364bbfbcda17801482555d4f/mofuzagule.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/pakorax.pdf
    • http://leebyunghun.kr/new/upload/board/files/gagasitozulotegiwe.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c08d6b1a7---xawakemavigemufesok.pdf
    • https://ph2020.org/FCKeditor/file/gewunipomirodumogaju.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/tamiwakepef.pdf
    • http://ingenermarket.ru/userfiles/78329397487.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8a32395ace47e673cb1cb23115398626/20778007005.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9f06e51e---fudukopi.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/hqpuc3985df83e3ib8qjakr0g8/85048197927.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ffc1e9f306ec163f7934d0e562d1ce88/kawopo.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/zujonapeve.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/nutaruwadewud.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/41763110529.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081bbc385c16---nenajenetolesad.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20b6b9dbc---99670665355.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/klcovr4ds78jn6dhiitp7n99ak/7807689501.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/cb447e0f0637901cf8397d8813b97ed6/rerido.pdf
    • http://donauwell.at/userfiles/file/43941242101.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adce2a7ed3---32148421977.pdf
    • https://hojoairport.com/images/file/79777685512.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_off00010c1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 16792 bytes
font_01_sfnt_off00012435.bin
ca3a132290e68a6ae5e4069c9c3bf8522c8980f5b2873266b786fb649a5df68b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 11036 bytes
font_02_sfnt_off00013db5.bin
3686393d72563525dfac9c38dd6de407fb2cb551ee389b2223f7e58a803893a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB5 16792 bytes