Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d96914aa8c23928…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 07:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8c2167760c2add816924f965ae3bd1f SHA-1: 8ff6b4080c8eccd87c1849c2015cc4855c991e21 SHA-256: 9d96914aa8c23928e1f0d4f50a90965443724a240524184ac2bf43097241c168
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=open+file+manager+from+terminal PDF link annotation
    • https://bisnismedsos.com/userfiles/file/66944226394.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58965482011.pdfIn PDF document text
    • https://temahr.hr/files/boxoripera.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/zixijikarowunu.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/jujiwesa.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/korexozotokenogu.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/rarobejovobaridegitex.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/91562688772.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/375275181.pdfIn PDF document text
    • https://banghenails.com/upload/file/mewizuwoxeziwalav.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd0a49c1b---kexenabudotovozilevuxes.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/78976846205.pdfIn PDF document text
    • http://safetruck.gr/images/file/dilijepafukefepeposigil.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7d0cc05ed4fc7af6d6550c6f3f534684/vaxet.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8eb4c702d---63889650421.pdfPDF link annotation
    • http://jevades.com/aircraft/fckimages/file/41151978567.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/72300313015.pdfIn PDF document text
    • http://usateatop.com/_upload/files/24628121397.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135135e2633b---42112812320.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1qri62dl12j9f6ph6ias8vd1bl/zuzotoge.pdfIn PDF document text
    • http://simoncaulkin.com/images/83598879236.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/dulexekop.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/85382117275.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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 19684 bytes
SHA-256: 414f241c621d0685c37c2156f62807b2b1e9915c62189aca6ee215358ea89406
font_01_sfnt_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 10556 bytes
SHA-256: ae39a141e0622ab2c7e60e0305fc991f42ba6a6f81d981ea6f2d6f1f8a3d418b

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