Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a2efb7fc1a0a73…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 21:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c0200cf9b26425cf6f36e31f7a38da61 SHA-1: 0a370c621ddc89338e4082d362e83eb88be2df53 SHA-256: c4a2efb7fc1a0a736805cb2a53b2faa55cabd254242a63fe882ca2925e030b58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, designed to redirect users to malicious PDF files. ClamAV and ML classifiers flagged this file as malicious, indicating a phishing or trojan distribution attempt. The presence of numerous links on potentially compromised or disposable domains strongly suggests an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ozmutludokum.com/userfiles/file/66736422854.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5o9njggb8sm3g34hqg855l51gv/sidog.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/nf7ofim6c2tenmpi4b8vankdeu/54448486530.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e92e478f5f18833188f48b15d4190aeb/bewozopomabogos.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bu3hu8i052ti6ppr4ituu7lunf/kagujanidaxunoxewijimuv.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/netusije.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6766c322dd8682f51d6668c7b515d393/30214404705.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/64f69e985f8fd51e76695e12443c9a09/tamejinamowajetojosanurev.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lonusafijukobo.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/49713785676.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/b1a49d29bb79dac0993b79a282636725/jowule.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/gatixejijodisonuraj.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/jupekojazox.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/23291917675.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ff3147b5---gerezosadewumanafibox.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3f5da8e32db2c5a4c045e95a97254286/ludep.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fdse8r8slbdl1jb76tpcg44ofb/3702761118.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acc9ad731d1---kujexo.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/18711278341.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/udvcpb4m5l88cs35l1t0jh8li0/38564187228.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3134a4f4bd---lotudatukex.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/mefuderinedimerolitomu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/679e010d502204800c63ec2f94b22c82/76807172481.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/menoteze.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073383b060cd---tikovaxonenari.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e31fdef2bc---32201095540.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c7329eef5---59764773345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=neck+exercises+for+long+neckPDF 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_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 16024 bytes
SHA-256: 389d110485076d47854c369a8082a7b6d1d075d3f0a3ff4d8b0b545b08811a07
font_01_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF7 10420 bytes
SHA-256: 533fed7379915af5eb8813bb98090feda0271539a2c0f18f519682d8b0e193df