Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bb4154c7e63a19…

MALICIOUS

PDF

78.9 KB Created: 2021-10-01 05:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e11ec683f90edb4b13902ccab92d48b3 SHA-1: cb532005687eeb33425c63635645e330e073c3d8 SHA-256: d1bb4154c7e63a19e66f1d2fa16c8c8108d005bbf1a66ecbdb3e06a0c66112c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution campaign. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely serving as a link farm to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=android+fake+gps+without+mock+location PDF link annotation
    • https://hotlinepro.in/admin/userfiles/file/sawezibewodijuto.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/takutefobuxuf.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/018e6a5d24d4168a2e11f415b095cf28/porat.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/todanurapupoma.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/6634522106.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/bilelebagogurokawif.pdfIn PDF document text
    • https://digireg.ch/upload/nokibopozirevasopew.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/zolibivezirezadu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/gobubekezeti.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ca62837d3e69e3a8bcc280675d1c102f/pabuguli.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/60728329870.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/vuziturogixixo.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/titagijupetuxizu.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/xejuserakifilupujitixami.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/lakis.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/95217466727.pdfIn PDF document text
    • https://qkon.ca/images/file/nuwotuxugijux.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/pimidizalub.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/20045571902.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebbfa69887---rosarunisajigidop.pdfIn PDF document text
    • https://dafelia.com/files/62879887449.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/42807718357.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/50618453517.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/52371119029.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/55716807642.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130674656c4b---47809612661.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_off0000c7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C1 19640 bytes
SHA-256: 3982079e82d78737f44c82b11a29ee746bd134d8b572d54310991058b06a738e
font_01_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 11328 bytes
SHA-256: f338556dbec1560d3b6da4835b0717525627e971aa5e665ac9d3e6beb4eb7d51
font_02_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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