Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e2a5127c14a27f…

MALICIOUS

PDF

95.9 KB Created: 2021-08-03 09:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f44e0d5ab3bb5266fa446ee31f8d10b6 SHA-1: ade5bce07674716123952b866f7ab785d058fb17 SHA-256: d1e2a5127c14a27f69e8a1eccccfdd5c9b1654ddcf59cbc8e7452de2bd3aa1c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/5a1a3f303ffdad157801458290d19e8f/5401060940.pdf In PDF document text
    • https://beaszemin.com/files/72556260577.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/ditudagimoto.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/nowewagivodabelinokakati.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/birebi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/qsnjnacfngmuu73n68nlpvkt6f/wegenojika.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/8401305374.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/nipuw.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/9770339220.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0cc6e329ccfa66fc3f2360749f104948/50741542230.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/310ab7721b9c452ea862421568b159cb/58394553753.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/galemexubejalarojabi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077901b9d0b3---57316076348.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/sufunugor.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/gitofatitem.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/64525691073.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/zipoxifitisejisisoz.pdfIn PDF document text
    • http://tano-cable.com/d/files/fovipagapuwokibodakut.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/kijuxuvasofafel.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76448510c---jepekuvanekar.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd2447334---47729218432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nintendo+switch+games+2020PDF 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_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 18000 bytes
SHA-256: c59475d0b5a68552a03f7b6ec79cb8e71cca6ee122fc618d1a1d11802127dca6
font_01_sfnt_off0001408c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408C 10976 bytes
SHA-256: 02dbc1778b8769156cb584054818f17f7fd08cb2f48ee787dfd0d66c948683bc
font_02_sfnt_off000159cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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