Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6cafd57bee3adc…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 08:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7801ab0fd36f5ad974a4e8a7c3aa5570 SHA-1: a22911cc6ae3edd86e92fd6829ec3e5fa3c11bc7 SHA-256: af6cafd57bee3adcdbd4ae77fa1c7ba613f3ee9b79188f0e5b8b8d816008d1cd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/553515e830a02a66cbb598741b3fc082/dinofafekerexuvozove.pdf In PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/dulonolikovuwefulefo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a09397e7---11331903220.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c04a4ac185---xinunanoderevodalij.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/roxumuzonuredosemawekorav.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/xulesufo.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/18980058024.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/53809638689.pdfIn PDF document text
    • https://777mto.org/contents//files/48074338734.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/64814013349.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1b0f799f22be78b7f3cabf41e5ff1e44/43432423111.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd56ca119f---91452287187.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/asgnlj8uoq6q2n3tl67j87egpu/16723691251.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/rozidipoxidis.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160839a438144e---71106442053.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/pozisefutufovu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e25104b2a---99416900081.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e23eef0b7e5---wawakaxow.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cfplja8ms9mgmfior6tajiqr7h/23307354418.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/h12fi84vb9puk0plf9t8mc7hbt/zomodogeje.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/087864e11151df7e925c67603dd31ec3/26420210463.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/doruboroboru.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/e7bea7bfb1f3bc775ba0fa7807243b1e/ketewiwinikewuvemifaz.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/savizig.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/guguto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sheth+publication+sybcom+sem+3+books+pdfPDF 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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 18824 bytes
SHA-256: 9dd3cbb1d7ebf8cbf55a1c5e33858e874f5b9e31ba8caf7929537fa286ea859c
font_01_sfnt_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 11480 bytes
SHA-256: ef516361e7f31b7d5bf9bd0d9ad404e7bb1821971e1ef162ab408cec4b31fcd9
font_02_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1