Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ef2f19597e82d2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 10:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e81cffd18b7191c8bb2e420dc9d7eca SHA-1: 35c6f01e3efb4689651a070775add755f6179564 SHA-256: d3ef2f19597e82d2920408ebe9df2aa5aa195c1c2069272861bd6c50f5ebe749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=how+do+i+disable+battery+optimization PDF link annotation
    • https://futurefacesmiami.com/uploads/file/lopilinuk.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/kibizimogotixozon.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/46511784618.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/49793962425.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/kokebaziwikuxuvusitig.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140315708e1b---gixera.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/52516082285.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/bapilusovimexesat.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/19456619389.pdfIn PDF document text
    • http://vipdiler.ru/files/file/70839277992.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/jixiwugufezifojudizerevex.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/40398834460.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/72562002993.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad9407906---12985385099.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/05/file/20210905_015253_108.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090506091073499.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/9759840608.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/12351898185.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/sebikive.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/mepalesagikowagal.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/vezewoteviz.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/53495175071.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/64381796546.pdfIn PDF document text
    • https://rinducm1.com/contents/files/liniseroxufagojujukajuk.pdfIn PDF document text
    • http://gugugroup.com/userfiles/vusodanowogipawamewod.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363f68178d6---pedugawaxijokuwemilorizu.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_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 10944 bytes
SHA-256: 5acb10c81ba6f201e8b6cf662425f2ebab13d6aeda6ba035a2667a4a1781ef85
font_02_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 18384 bytes
SHA-256: 61963b725fa8d7043b9c4d966c5d82b1ecab0369f9477e47832769ea2b5da19c

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