Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b089f38e2813e8…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 09:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c04b528b73d0958bbfd861be47863c1 SHA-1: 3f851ac8027f2e20b6ddd742ce168549b96ad3d9 SHA-256: c2b089f38e2813e83e4229245ea369f38ffb238f332da5afa7fa307f451394be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bahispesinde.com/gnc/veri/_files/lorefuvowamitiregakimev.pdf In PDF document text
    • https://dusunceokulu.net/resimler/files/76102102517.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/37634492853.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/garelezoxenavofajidul.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/66148729110.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/bupadoretuku.pdfIn PDF document text
    • http://skomi.ru/img/files/file/bagonirajuwinukebokajejaz.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/31567585634.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/devikejokaviredazidipaxaj.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/godinapizaxorobulofevoba.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/58458272349.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/fiwetefatuwik.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9e069b42---vaxufopifi.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/mefitowozelevegetoner.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/91793406038.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/bufadufunag.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139db1445b09---42968411222.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/28564131071.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/butare.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/73263402166.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/70c4f6acc93d8381d0045669ba755ad7/wibagofojijujuroxa.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/tomumifedosiviwa.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/dokelopejotulemokopodexo.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210905_065229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=viva+video+like+appsPDF 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_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 17336 bytes
SHA-256: 259f8bb77bedb78011a9ae1a7bdb0c1e73e23cfd63f81dd1c8744f62570c085f
font_01_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 10208 bytes
SHA-256: 2220565742b377567752bfdcbff4d5e169b9fad1a8891a48d17714654d93942c
font_02_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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