Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6eb9cee292aec59…

MALICIOUS

PDF

84.8 KB Created: 2021-07-19 23:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ede7e648e75a5fabaf27f579fb4ea20f SHA-1: 21a39b5443df19b6bd71695c7b0fbb417cd58061 SHA-256: a6eb9cee292aec596176c0d5d4d7c73c51f84ce7ad031d548d24a61ceeb81b01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of a 'free donation receipt template' lure, combined with the hosting on compromised infrastructure, indicates a phishing campaign aimed at tricking users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee5e6fccf---neletisexobeselu.pdf In PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/elf4ht0htpvi5sa73etmha0c5t/vekufipexezevasesos.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf95e33e0---91887886495.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/764905bcfddc0f49d80b332df2818bb5/96374920993.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/238hctom0j60ur6diip905p6nq/49315421551.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bp1lq51lru5c1i484chd0gfg34/48365247751.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df1d3abb8---patuge.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/nivuvajalikiwuzezumid.pdfIn PDF document text
    • http://www.asslar.de/downloads/kunonasa.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/83425907838.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/33746122280.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/178m4e8l20bh95083p4gfpgd3b/loluwanufuzeduzafe.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/rulukegaxivikilevetu.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/sugavixoluzewexogobew.pdfIn PDF document text
    • http://araonline.hu/uploads/file/96237269711.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/petujonopetezijibokule.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/82223545920.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/422abb9cae35670b7b2e08e986ce4168/kabikak.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/81440850262.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cc61c8c1226880beb794ad03d924340c/balokub.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pvuksadd8871996kls1j0mdmd5/75401610197.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804b3d7716c---77672670780.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2310169058---65273850230.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/80318320774.pdfIn PDF document text
    • http://thedigitalscorecard.com/userfiles/files/netemalotetosiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+donation+receipt+templatePDF 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_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 17372 bytes
SHA-256: 7988696fbd091c4cf0a78b9e324bfa7b00ecc0bcc4778e85909b1d5958fca463
font_02_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 10484 bytes
SHA-256: e2c9bcb4adb4609e6cf30a07b23a73d22645f32326a243f5c55202e114fa456e