Malicious PDF — malware analysis report

Static analysis result for SHA-256 874e70900b7e67de…

MALICIOUS

PDF

92.2 KB Created: 2021-06-28 09:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 016a8216a4bf665fed2f6c2a3e3c2643 SHA-1: 8d27ddff0adaced1ae1ebf87afb8a7aa1cfaebdb SHA-256: 874e70900b7e67de7d927bdbff6c88285d891a0475c2c3a4b0daa916393dba43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to WordPress sites utilizing the 'formcraft' plugin for file uploads, indicating a link farm hosted on potentially compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or redirection to malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66cc5c687---vetadifikekipinavogos.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f071192fe0---71854108496.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac223202f26---7904023076.pdf
    • http://kiuanai.com/userfiles/file/sulegoselu.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bafcd908f4---79388339005.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f76f7db2198f06ad2a9916bc16d79278/60158156094.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5116c2b18---69011151027.pdf
    • http://chiangmai-clean.com/user_img/files/81283196976.pdf
    • https://ckmusicdesign.nl/userfiles/file/puxikaxogomip.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/29a34003e0cb11b8e1283e32b36d372c/senugomigu.pdf
    • https://babamore.com/upload/ckfinder_temp/files/20210531015101.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160855c2d288f4---nutikotitamenogosoj.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/51f658b587a6bfb1042ea774f3656308/34820931196.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7cef782c2---25641606157.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/60adaad0c848f4ace2157239526cac5a/83310337450.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/sqc7j1f4lv24scmtdamjsfllqv/32390412527.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/22872280267.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66caea306---66802580667.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608126eb87205---sudofiketekolodu.pdf
    • http://musicpark-live.de/userfiles/file/60444365398.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb1a7c5a8---vonusexatiwipadota.pdf
    • http://kiemtoanhaiphong.vn/upload/files/fudanunopatifoganixumison.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cbcf4ad99---42936363452.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=our+carbon+footprint
    • 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_off000106c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16792 bytes
font_01_sfnt_off00011ed2.bin
8c02f5a42824f967ea89e4cfd7360fdb54775654e816b4bbfc76312b1c68a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 17340 bytes
font_02_sfnt_off00014c4f.bin
a2f6abd88bb46ba189a71849a9e26cb7ca75292cd2ef04d34b4c947b78b8fbc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4F 10392 bytes

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