Malicious PDF — malware analysis report

Static analysis result for SHA-256 340c03eb58420de8…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 21:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1d9c8d057c5e5c2d46705e7fb509ce4 SHA-1: 3c257cc028326b55bd737f2b39265eb8ccc41d26 SHA-256: 340c03eb58420de8e479414dd299929647fe46785662875e1fbc5182e63e4f53
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on potentially disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The PDF's structure and the presence of external links align with the 'Spearphishing Attachment' technique, where the document itself serves as the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://littlepearlspublishing.in/data/eimages/file/juwalubifimuz.pdf
    • https://kovtec.pl/eurostyl/photos/file/5381375803.pdf
    • https://volnynaklad.cz/data/file/8968045722.pdf
    • https://ccskin.com/geektic/files/ziboxototupetogagowobidi.pdf
    • https://canevastoilestjean.com/upload/editor/file/vuzemivebefopa.pdf
    • http://zhymwz.com/upfile/file/54881819935.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4670e6a1246c9e1690ecd73c9d9a585f/dudanibagazazamikudes.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a3e5d76d78da52b526fd58b03c93903b/rafamelilopokawa.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb4c43c8f8---numikozenula.pdf
    • http://www.petercar0937494634.com/upload/img/files/pidulilezolu.pdf
    • http://inistor.com/ufiles/files/66849591876.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609838607c5dd---46802138255.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210704024243184.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16082267cf1333---xujolexamusewoxu.pdf
    • http://ipayon.com/root/FCKeditor/file/petodomadagelirurazejevuw.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/bstkfv98lmnb2jqlph2ksi9nd2/kakoxomewopukoxag.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/64218cabc409512d3638f88fdd110aa7/bosifekixunavajom.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fe555c059f055335720672f385a22fc8/6084277610.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160716c397affd---63061370216.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/60582d351229f4b4158db3240515400d/69522696416.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/46152049644.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/85qcj74hsgasv1gck7on3ljfk4/23368170498.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=nepali+song+lyrics+pdf
    • 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_off0000cf97.bin
de52323d9739ba7108c191ed96b6d37b26a71ff801838dc2f4afa36ed7dce202
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 10788 bytes
font_01_sfnt_off0000e85a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 16792 bytes
font_02_sfnt_off0001006c.bin
c1f811c64e5780ab416280c1f16b3d3cd426ddcd7f2b3899ddc79ae6d9960869
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 17696 bytes