Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0ca44789237feb…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 00:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0660f1c769be85c1603aa9030817abf3 SHA-1: a5ffc4a33f5bbe8f366e8b21846668af4619a87a SHA-256: 6c0ca44789237feb5cee6acb0b955e19dfcc06fa2a26e9adc9ffc44d0f8fe245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16106c0d1f14aa---zovewidusuzag.pdf In PDF document text
    • https://autosaloncenter.com/uploads/file/fomipu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57398ffe3---92055552914.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/81146830904.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/razafenenu.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/jotalowaxatukiza.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/7i1f0lva3dpgmqomfqc1i58qb8/rezujil.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/leruvedagubo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a3f115c5---6362930126.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936f663f436---gegiborinumubazuf.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/2p04ghh1mgch6rbe5ccgkjodg3/90853873736.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/32721904473.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/72273738409.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/wimazunufexaxufu.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/kodujoxeriruviwizewajusiw.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/89636913741.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/pivokojexewesururu.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6954bd9c4bbfb34221ec00809773d12a/15281150150.pdfIn PDF document text
    • https://masihpt1.com/contents//files/40714295782.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/57337224361.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6167e0affd---15160153921.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/beterajibemisolirotitufud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=glucose+transporter+pdf+2015PDF 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_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 11088 bytes
SHA-256: 16aedc26e2504ccdcad0a08101a7619781ecae29719f0705919636d8a3690e30
font_01_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 17984 bytes
SHA-256: 1e04ddef3238f7fccc68dcafebd02b43ff08dce8b6c4e88ffd2dbfb3b850a858
font_02_sfnt_off0001387d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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