Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe69ee5e0edd213…

MALICIOUS

PDF

87.6 KB Created: 2021-09-22 15:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9620bfdfb435ee88d4f3ea0c566100d6 SHA-1: f21d2764aa4a6993ce8d4d9653cb7212fb7949f4 SHA-256: 3fe69ee5e0edd213029ee76e972ca46bb6395f6bf0f8c3f55e082d00e6787ea7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear textual content, but the presence of external links and the high heuristic scores point towards a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://kunjipsc.com/uploads/files/4989712223.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4cfae225a9a18d26733d012accaea156/77409860025.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/90060931304.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/felefarotuxojokepuda.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/vibijesusapitu.pdfIn PDF document text
    • http://gro-felix.si/uploads/73445560269.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/22894673759.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/gebopasobanepezi.pdfIn PDF document text
    • https://esvigo.com/upload/files/84229933550.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/75013533289.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/10012020936.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/48137302589.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43dc72e2---babokidaduwi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/869c08e590dfc30cfe468d79e460264a/vuriromukonupufixa.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/br2o9h6tpkvv1ulsu2lvf0grvp/58534169430.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/tobuxizoboxufupikej.pdfIn PDF document text
    • http://519pf.com/userfiles/files/xuriletafa.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/52961338968.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/59775832145.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/15150531326.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/41774270678.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/30150942519.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/71702353867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=om+shanti+oshana+full+movie+with+english+subtitles+hd+free+downloadPDF 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_off0000e7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 11216 bytes
SHA-256: 336683c437ab50e4402aafd10ef92959e76adf21e0a37e30170304b8f0f752c5
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 20960 bytes
SHA-256: 1b2ab967cd0aab959b5811a204c066fdfec8ab1db67f4fbe88e3ec9ac2cfc7dc
font_02_sfnt_off00013817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1