Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f06d5a95cbc62da…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 13:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b01c93f6e8f32ea73c687b7541c6b075 SHA-1: 05cf935968a93e798ee5046c2ddb5bde6f7fba14 SHA-256: 3f06d5a95cbc62da6fa6f57c0192b58d98f1cc4f3c1a11ebb6000fa0026001ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, pointing to multiple domains, some of which are hosted on compromised CMS uploads. The presence of numerous links on disposable hosting suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://leciv.fr/uploads/FCK_files/file/jexadilak.pdf In PDF document text
    • https://birutelorasin.com/contents/files/84675666939.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368078b8730---julubokunumenudajifilub.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/fozunufebuxinisibem.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/64007587883.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/65242907952.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/86168137756.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/15340785702.pdfIn PDF document text
    • https://33mobility.net/uploads/files/46839551006.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/7577979055.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/bowawuxelegefadixur.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/39366127868.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/vomabuguzarebuzepujitufej.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/vepemeripepe.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/18775929534.pdfIn PDF document text
    • http://thepducphat.com/upload/files/wiwede.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/76455003592.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/7905780398.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/geteruxaponupanoverakuteb.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/47080484170.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/foxunixaj.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d0b42b440d601e01232053608e5066d9/pilebidugepudat.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/33062785258.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df4e21228---boziwizixokokififemixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+make+slideshow+in+android+phonePDF 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_off0000b14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14A 10828 bytes
SHA-256: 4e3cd61130b6c1ca10646bcfb35aa704049cf8b843176d5332516c3b1a60e493
font_01_sfnt_off0000ca11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 14496 bytes
SHA-256: 11d0caeed51571391c8a4a97d46156278f82615e77fd1d317f6248977c90febf