Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a63bec73e3261c…

MALICIOUS

PDF

93.6 KB Created: 2021-06-29 09:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0a710ef55e3498ff7967c9a75a2565e SHA-1: 14243c5f27c9e6e053f3ff80231864d0aeafbf30 SHA-256: 02a63bec73e3261cfe66dddf7a2caf23176b9b7510cb3ea66efa0a143cd1cf58
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains or CMS upload storage. The embedded URLs suggest an attempt to redirect users to external, malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aihr-iadh.org/uploads/FCK_files/file/wikelo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa4bda155c---59227871142.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed2dc3af25---84597911159.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080584987f8b---verurozu.pdf
    • https://htchninc.com/d/files/rupiregivoxilanozutad.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13e9d99dd---83261272292.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/bd43d31e3a324d4ebc908dfb22011efa/13213831705.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085c278aef1c---xasof.pdf
    • http://argol-editions.fr/userfiles/file/robitopavikurejepubi.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/91f153d44f95b5235bab1e3a0500541b/tidurezuvasofiragif.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sl3kqel6oooiv39aucubttmgii/zidunizulonixanaxevizeg.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/saph8gvrf3egdgvipsste695n0/kufofifadunilozedilaweraw.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u0up552rdd07dmb6k6ltljtca6/17955827729.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078453de5020---minilogodalikop.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913e7321bb2---95547108342.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/piraloj.pdf
    • http://ampletrekking.com/userfiles/file/53384172093.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4dc26fb91---texegopufaxafijapegup.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae67d0d40---rukoli.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57127c4ef---62918115234.pdf
    • http://tz5168.com/uploadfile/image/2021/05/16/file/20210516_115607_108.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/7eb1c1290385db8b1bd57d443a2694c0/ruroxebibofizame.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=author%27s+style+and+tone
    • 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_off00010d7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 16792 bytes
font_01_sfnt_off00012591.bin
31253506638d004348d33753d16b8d17d5e4e2f436daa54a34e0dd8985b6962a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 10484 bytes
font_02_sfnt_off00013d7d.bin
a54a424732273cde240ae0131054a9cc8b541b2df2df0ee2a86674c0e11ecf34
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7D 16772 bytes