Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb794bb5016ea9a…

MALICIOUS

PDF

77.6 KB Created: 2021-08-11 23:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e666a8cc0586559fa942b4a64bb541a9 SHA-1: d1fa603202f73f8878b201a766336fe754c9f592 SHA-256: 6fb794bb5016ea9a0312a9eae683e6eb0fc35fc01112242cf484fe604c9042b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://flagrant-desir.com/userfiles/file/vokaxarejurideguseluf.pdf In PDF document text
    • https://atcotourismtravel.com/userfiles/file/jusijekux.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f230662dcd---xisafuxotobizasa.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/zapopife.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/giresoxoleridalawegaj.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/wajasafupivuzibulu.pdfIn PDF document text
    • https://jetaime-shop.com/files/59529214620.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/68168664056.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad1166406---639549746.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/67690472660.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809b35c662c---72544801025.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c5b3603e9a7f6c7a7448fba978e535dc/rozewuluwinag.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0de5836a4---11352329834.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994b322e3c---lizopodavadomubinuva.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/56123498381.pdfIn PDF document text
    • http://northcity.rs/slike/files/julapofebifubo.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/vafejawodobupofif.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/laririxawevomutobizo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/19e6b9c161fa84d8e9feeaddf3bb8b03/35920341510.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/10838459227.pdfIn PDF document text
    • https://ka-base.no/images_content/file/jujisolaxafumibimam.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608282dfbc29a---gusabifakujenenupuxidufas.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/99747e5deaa93aac159828746a093639/bubegilinipif.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/c1er5cnje1pmcghs1pf794fble/munivowuligalonu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/temenosetitafizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+reset+my+chamberlain+garage+door+remotePDF 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_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 16200 bytes
SHA-256: e4d151195d2867ca3dd29bc44f92d3724e3a717307d86fd14179871463f186a4
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CED 11148 bytes
SHA-256: 9b9a609448b595821efb25829a5c1e0ac839bac3fa5b023cd93566cc0e810955

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