Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88cc2dde5108271…

MALICIOUS

PDF

88.5 KB Created: 2021-09-24 09:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93779bda7227953cd0c3f243b3739b62 SHA-1: 5c0b08f1d6d5b2f5c3b1f36fd2c865249e155976 SHA-256: c88cc2dde5108271f2a354bf64e5a58e264936ef807182d378a8a3f884ed634f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern involving user redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://abwingsde.com/uploads/files/fapetudemidamijuruti.pdf In PDF document text
    • https://carlojans.com/cms/file/divovitonu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a097bab31---witowumifazefalupizofas.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/43453960748.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce5c8afaf5---likejuloturumisib.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/86839152642.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/vavudaluva.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/30998382966.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/nonariropugejopa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeb97cc5e5---zogepixopuzegemavup.pdfIn PDF document text
    • https://vzglavniki.net/data/file/mudunosudemijamamufuwo.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/94031248541.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b10c41755---kidijafutomerolubozow.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8be98badf---74925037962.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/girego.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/tezebenenoxatoxali.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/vokukezesudew.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/39956573514.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c4bbcd86306c890ec803de2fc2212cc6/rigekifir.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/tagetovokagifubogorun.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/viduviromiviseroj.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1838933748613e6eef7047c.pdfIn PDF document text
    • http://askort.pl/Upload/file/mejoxu.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/85694794716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+shut+down+background+apps+on+androidPDF 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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 18076 bytes
SHA-256: fcd9c1ac9747491aee8cc874c63354ed9b7211e7da80c48d80b5745d0c384b11
font_01_sfnt_off000122a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A6 11024 bytes
SHA-256: 7b34470d5c113b72caf6e94740032f8b4aed4c198981225896b91f82f6222686
font_02_sfnt_off00013bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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