Malicious PDF — malware analysis report

Static analysis result for SHA-256 c598df1a34872b9c…

MALICIOUS

PDF

102.7 KB Created: 2021-06-30 09:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb8140ec6446c3d7c629c10fdfe79676 SHA-1: afb31962c23b428acd024ed8fc7f0d949cc7e9fe SHA-256: c598df1a34872b9c8b4dbdb03fa93e96f0ff9ec2e4d381bf9eddfea533f9a31a
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used to distribute malicious content or phish users. The PDF's structure and the presence of external links are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://netiko.ge/img/Data/file/ratobep.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57a588b6a5---tozifolerivamenubiwodu.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7626f177d---bosekuligarorebab.pdf
    • https://aimhc.com/userfiles/file/83042020761.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb554e1257---ravojopizenorabiga.pdf
    • https://alarrabnews.com/images/content/content/file/tomifavetorodut.pdf
    • http://utuin.net/files/fckeditor/file/gixenokonazadeveju.pdf
    • http://tajesink.com/Uploadfiles/files/31458980447.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6374776bf---49086235264.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/junmg1b945p6edd9iagoobat40/xiribokenamaniwoxof.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/44517714262.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ccb68d84affbcc0677b6628e05acbf3a/91515883402.pdf
    • https://1877painters.com/FCKeditor/file/30615894374.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/obv709k3uo5gvc89mtlofvhcds/98565093463.pdf
    • https://kawanmto.net/contents//files/bexosi.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3871a74c---96497312087.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pmv66hmrq9hii962k819qclbhp/25115689500.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/020b84bf118e00e3d7cb7138d2194f2b/vubefisevefetowenisolide.pdf
    • https://pasarantogel2.com/contents//files/22289383257.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4b565cf893e4de56dbaaaed395d19372/93213426790.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/cd43199a4cf2e3ae524157892400cbb3/78927518335.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146640155a---14517366255.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4cb7d83e7a442671a0a886d901c2d6f5/16764390170.pdf
    • https://arrayamed.com/userfiles/file/67487397035.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=first+french+empire
    • 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_off00012b12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 16792 bytes
font_01_sfnt_off00014324.bin
6af50b3f9207aa8d03f105bbf00bcaa8597b81f99c2224d6681b8108822c05dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x14324 19708 bytes
font_02_sfnt_off000174e9.bin
183832c4bafc3fa8d3bf539d0388f7eb85d8a836fa36d4bafb73c54706015806
pdf-font-stream PDF embedded font (sfnt) at offset 0x174E9 10396 bytes