Malicious PDF — malware analysis report

Static analysis result for SHA-256 6722738143cfc1df…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 17:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f99083d833ea960eaad566473bc9c341 SHA-1: 2ca2440b73f3b38a06d5854724c894698c4244ec SHA-256: 6722738143cfc1df6749632d2390fc8d3db19cd9215ee3079a343d8e68f38691
156 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to potentially compromised WordPress upload storage or disposable hosting, suggesting a link farm used to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://basyapiemlak.com/yukleme_klasoru/userfiles/file/90592050382.pdf In PDF document text
    • http://intemhathanh.com/img_duhoc/files/26730832292.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/94393857087.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/36881677474.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/24639178429.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/kasafagimovakisudovojam.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/775f54a83ed9eace7e8837276345a38a/72967804024.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/94854793316.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/bagofuvupefuzin.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/22115268626.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/jitogagidibotuw.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/pegepejuzusu.pdfIn PDF document text
    • https://telorgabus.com/contents/files/bitiweletowa.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/39591707237.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/49905537987.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373c49aa13b---mimukufatuzavonu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2ee92042---66824559775.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3eb02215---mokaj.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613817d2b0c2b---72989019083.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2081e6088fa3d9fe9e64ea88b7f1ce77/34524991002.pdfIn PDF document text
    • http://matras-devison.com/upload/file/50651757460.pdfIn PDF document text
    • https://iohrp.org/f_files/files/96152795179.pdfIn PDF document text
    • https://mangallagn.com/images/file/xuladafet.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/16407954781.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/nufavodovisep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+cropping+toolPDF 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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 10336 bytes
SHA-256: 70ced24f8fc060dbda7394dac886cee8084404e0be2909a6b37e3b7c9121f078
font_01_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 17820 bytes
SHA-256: fd9cec9f6b3d871bc13feacdaab8eb2f0b2d4e3cb121d77d2a7f139f9d5b48b2
font_02_sfnt_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1