Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae67cb81b7a22b1…

MALICIOUS

PDF

75.3 KB Created: 2021-06-29 07:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4eb28e0c8216946482d04761ca37976c SHA-1: 6bc5472d2ecca67eb6a7e5fde1921d5b30818593 SHA-256: cae67cb81b7a22b1b4c8c58246635f510681ee7f2d1e56322a4cd9ca2724c571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on compromised websites, suggesting a phishing or SEO poisoning campaign. The embedded URLs are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bea3151a213---gaxagekuk.pdf
    • http://dynamic1984.com/user_file/file/bevumojumi.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/33857078594968792c48ab7159a2b217/guziburexinevamuni.pdf
    • http://bukharageorgia.com/sites/default/files/file/6181284761.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/95dbca1913c0631f47d499171ca4c0dd/82843751202.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/12cff98e7e60861b9d840eb108dcd208/59330619204.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a145b8e0b4f---zojasaravuzonokaxotolu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4baac11a5---jaxuzixezizumugu.pdf
    • https://branchennachweis.eu/userfiles/file/87654468921.pdf
    • http://adabaskimerkezi.com/upload/file/tovibefewamozifor.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5cb2e0da---34245943564.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/be3ca7752a7fbd79309d1526713a7a9d/navuramotagivoviwigaz.pdf
    • http://22743333.com/userfiles/files/42175061068.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/667abc4794e2ea351c147ed6d8acdeac/99652606712.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9fd28b804---441299323.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837880bdd9b---1396451685.pdf
    • http://akicgiyim.com/userfiles/file/40408799007.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16074c46012860---19544682912.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdcf1bb958---polezasodovojazeji.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/93306177588.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7348c116---sofapijegibapevataj.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af80aa467d8---kosepa.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3bba0972---39612210414.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f3ed42f75353f11ba65f5ad1426aea46/37098778318.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=process+costing+calculation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d6.bin
9aab2704fb25ab24a6eed09d7341500350be4a55f7556fde5a6c785d46e36f61
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D6 16224 bytes
font_01_sfnt_off0000eff1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 16792 bytes
font_02_sfnt_off00010808.bin
393b0a90f55217674956f7a8892a5a468bdb62422b658ac2708c3a9b9ef86143
pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 10504 bytes