Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa4394d93bfdb0e…

MALICIOUS

PDF

89.2 KB Created: 2021-09-20 11:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a6294df5d32f8d7fe885c0e02f94d34 SHA-1: 96e0f629be13460e3247897714a39e1fa5248337 SHA-256: bfa4394d93bfdb0eb492b7250648ab08a4709adbd91f0b832420b26951cd4f83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to malicious content.

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 https://crewmak.ru/uplcv?utm_term=best+stock+android+launcher PDF link annotation
    • http://vetsnab32.ru/userfiles/file/4182093670.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/pogexexudizujugabe.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/likadelogogudikajukil.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/98954331743.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/xededabujonulufibeko.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a3de2755---busovajijitoj.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/61411586572.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/31329131316.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/40872403707.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/80511142370.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d866257311---57648273705.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631232814lunavilojag.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/97413571345.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/55700141548.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/48640553935.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/27089096257.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qdm37f8guv85ld7591grrq2gku/lejegoxujexanegorovon.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210904195412.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/43646176709.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/pufefigube.pdfIn PDF document text
    • http://cosyromania.com/media/file/53469345761.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/dawup.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea990cabe---93933792675.pdfIn PDF document text
    • 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_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 10712 bytes
SHA-256: 238ef279f20b1addb31d4e9b72ed5794d01adc4b08192681747dd4b4a44d887c
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 17456 bytes
SHA-256: 759907aa452fab33e3fddfb01e8bc047555090fd66b688807b3af1192071f641