Malicious PDF — malware analysis report

Static analysis result for SHA-256 274677237b1fae58…

MALICIOUS

PDF

79.9 KB Created: 2021-08-16 15:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39ab47576f462fa72e86e0c9cfb5d668 SHA-1: f979765662a9861e6689bf39565526d38e3ad224 SHA-256: 274677237b1fae58193055c7d58ab70b35076d4d1fe4082061912071c297eff5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sanagustin.cl/files/92652056165.pdf In PDF document text
    • https://muzeumkonstancina.pl/attachments/file/pesirawexisarigipo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606fabd1249e5---42097730761.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/lipobobuxa.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/77634431812.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a755e13c28---37843592334.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/wakarizazarifivegone.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/vugile.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/44871452018.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075633b14579---52294788500.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ae961d50d6a50c9686d331dea6ce085d/51031967889.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/89385750720.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/xobosoleboveputepi.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/xinerodulot.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/segoxiwugajur.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/digisefomu.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/97526708133.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/23579445521.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed12d73d5b7---sisurava.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ncctt4csftkaq30mq6k183nqvf/vufupefe.pdfIn PDF document text
    • https://plasy.com/uploads/file/jiwidiw.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607740dc45168---79063292836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=animated+video+maker+apk+downloadPDF 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_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 10608 bytes
SHA-256: 2ab68a58ea57f0f98c9f647969bb03d7cc11d0df8b2ff2a2ee7b90dc03140068
font_01_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16288 bytes
SHA-256: ce87b3f606b01b8f8658b6d0dd17e9c4527cee14267787d34053f62525e937e8
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1