Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9fa2c923d1ac6f…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 02:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f18ee00b8f73196e96170cf5a8a2c4c SHA-1: 9dd858b6b4cad385cc3ad9428225b3c3f101b330 SHA-256: 3f9fa2c923d1ac6f2b5d07e8b6d4e0e0b37d19c7354add49ab5d361cb763c3bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of many external URIs indicates a strong intent to lead the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=what+does+er+1f+mean+on+lg+refrigerator PDF link annotation
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9koqppfcl5tgu911f77nenj4qd/26486260343.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/14916948165.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/92648e5d672f7008e1a3dd5e31b05aa2/54429432080.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/42909434588.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/zumususekegofolipenifab.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e03d5c4de---xawexoraramuzigizogo.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/xobatovowukake.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/wawiki.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a551eca08e6---98810247160.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/sarukaxarejisune.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ace0f29ba5e---36394627378.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085220ed7118---kakabu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/s9emcqqea1cvtbpvt1jtfa7bvu/vovimadesuvanekuxasajarel.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/diletamosenuka.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d61674220---xijibakefunajarurip.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76391616258.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/raduzagivetepoziragedejo.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/vurasipovevozexakutaki.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/22400077646.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/de5f0948587ff88e635fed75849559ce/21853442725.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae921064d0---8722527170.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e349ee48---5752739698.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/7417307274.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/70bfe9be7c25f2a9bbbcb346bfadb559/jibodinufu.pdfIn PDF document text
    • 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_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 10848 bytes
SHA-256: 041d154eac1677bf77f505126a94b0ccb89e02abfbf93f152ec63fa080ee9083
font_02_sfnt_off00011e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 17160 bytes
SHA-256: 410f7dd78e56bbe3bda292bb37dcabd2e747b15a9850afdcac070165dda5598e

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