Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a751df725965afa…

MALICIOUS

PDF

89.1 KB Created: 2021-07-22 02:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d1c98494b622beab72692807ffd1d62 SHA-1: 270cf25b4a1c7467f75889d72e4be2e41f90209c SHA-256: 7a751df725965afaae35a4995b9776bb039a8d0941fe95f9e70ebe075bc7a987
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of numerous links on potentially compromised sites indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7cff7e0eea025b33a7c6c6a635d72b54/18126897423.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/945b7211b657ff7ced7186660475fedc/91891702301.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/85673706919.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3abbbe51c---95706746386.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/pafasadebewejolawotu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70ce169e8---61592633459.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1b73411f5b32f5ccbc0e59619421904e/xekalikaxi.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/nll54g79qpglh9bsu65pfsaff6/milaxidarejono.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c380a010bff917ef61e26d81321231a3/66794879949.pdfIn PDF document text
    • http://chayka-svg.ru/files/29422926329.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/047b9550841c7f863e39a03626341303/zapodubosodezikurik.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a728468079f562c62cf86f1c9b092d13/44510886061.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608074175cc04---vinuxetalodovijuzosuv.pdfIn PDF document text
    • http://htwy.com/upload/file/fetav.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/74459358194.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/81143948758.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/33952491694.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/4trmqllmknp29shqkeidbnati2/somekejukepu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db52846ae---59738918105.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/72249956076.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3abba5429---duxavulubusobabogubesuk.pdfIn PDF document text
    • http://skomi.ru/img/files/file/zomavofogexojata.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5c8r8fp729a0vbhquceqv0j2ho/62392638254.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c450c607d708b185afc38dd55a5346a6/rozipe.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072df32a3fe1---9416917617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+cars+2006+online+freePDF 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_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 19324 bytes
SHA-256: 711680877148baf7fd44257b2d3bd452b085820ae8a652b5bb342dfc8a5e6c6d
font_01_sfnt_off00012548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12548 10836 bytes
SHA-256: 4ebbb7cad9ea72d2093a7c14fa59b1fad97851c2a731f6cbe2048697ed3763cd
font_02_sfnt_off00013e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1