Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddb34be9a32bfe4…

MALICIOUS

PDF

68.0 KB Created: 2021-10-02 21:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ca226acac9f22c02e2e32678ff74d3c SHA-1: 22870433d567974fa33952e21e988a1611a09206 SHA-256: cddb34be9a32bfe42af1d031dd081eb2fd79996e4870d32443ae0770d35ab163
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ags-sib.ru/ckfinder/userfiles/files/sewosutukofa.pdf In PDF document text
    • http://sql110.com/pic/zemigevu.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/vuxetawiraloguriba.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/80830130711.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/70361561379.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/ralopinupa.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/23355415335.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fupemaxexemovomibepon.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4108af4629e60aad96a341bc723f1de8/bosib.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/44216742799.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/89813160324.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/mipilemofobuwunaxe.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7ri7e2ktgjmb28i0km33v5kcu4/damesategepaf.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/baguniporegezoja.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/52721081906.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/12041424662.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fugidazunoxusovalazuvol.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/januw.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/tixososotobizage.pdfIn PDF document text
    • http://zgic.ru/!upload/files/24803171509.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f5edf8b0dd422b3b6dbe2fbe1f01b219/paziporopekim.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/50582897363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+is+12+km+in+milesPDF 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_off0000ad07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51E 10408 bytes
SHA-256: 15c7cb023e166f1f6e83ccc32d5e97793240d184a7ccbc252446e19f3d09de5e
font_02_sfnt_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 15464 bytes
SHA-256: 6468d8b8b9f44f37e193259f50c5a0861dcd3862a0d00e5d675104677f74f5e4