Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccb6c1132fb65bd…

MALICIOUS

PDF

86.4 KB Created: 2021-08-14 06:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d91e15827e785fb325816c6cf87f2979 SHA-1: 442fb3f3c4c9bb6e0ea1bb2e492e1e7807b2a5b4 SHA-256: 4ccb6c1132fb65bd84ebf232bc0bbd67297d37667eb4d404ed618cf20c69b118
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple external URLs, many of which are hosted on compromised CMS upload directories. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a55e1db0ae0---17730115833.pdf
    • http://gerd-pollak.de/userfiles/file/paturalorezuse.pdf
    • http://knuhpharm.kr/userfiles/file/20210808224846.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/be017t6uc8vs6shpjbnb4js6c3/96444458888.pdf
    • https://ijieet.org/ckfinder/userfiles/files/xozavoledejuwu.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1008b075f---vetoxujutekabutanasatora.pdf
    • https://riwg.in/userfiles/file/56456759722.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e43968212373fb7cab7f55d29cb0f1eb/87809133659.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/lulavugopopadiwivoduge.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609476207f182---27008417386.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134373ce6ea---63977711116.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f30e614a5---sudido.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2893f556b735c33b5117b335f60520ba/75084391112.pdf
    • http://goldnumber.info/userfiles/file/tozegavituv.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6500c62bfd---5354465629.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0uspm0bookec7ronu0m09a65ne/sewefakomigejeluzexolu.pdf
    • http://mopi.eu/ckfinder/userfiles/files/85172790928.pdf
    • https://derey.nl/app/webroot/files/userfiles/files/magiruwemulupoxuzijiloso.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/17e0587b4c88164c6622cf87e3e360a0/74082970254.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5c1u40d5v1u9vdsd6281r71t1d/18257504525.pdf
    • https://badoza.net/userfiles/file/segadojejiluximokupap.pdf
    • https://airbays.com/userfiles/file/86788722254.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=can+a+landlord+charge+for+carpet+cleaning+in+mn
    • 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_off0000ed91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 16792 bytes
font_01_sfnt_off000105a8.bin
c3649b451ecda12474aa44433f500b1f38ad4fd74b83978a2cf926c1e51527f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 10932 bytes
font_02_sfnt_off00011e88.bin
857d6d6922bc77ab1855ae5ea9f4d5d22346d72ec4f0a2a851a6634374827297
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 17324 bytes