Malicious PDF — malware analysis report

Static analysis result for SHA-256 685cdce793daa2d1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 15:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91c324b869c5f9b6e237f99e8b78b249 SHA-1: f1055db2aede969a472a48b83f83a48a30370af0 SHA-256: 685cdce793daa2d1af4ee51cb7a958bc0acb40b1c4f72a8b39809a93d9e095ba
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and a link farm structure strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lobi.md/userfiles/file/56171735417.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/beb8c372a4558d2e9b9aac0bfdefdccb/43825107536.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/janubipejasoguzigutap.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/34250707668.pdfIn PDF document text
    • http://master-br.ru/img/file/vubatijowuforulodusupek.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/70752802823.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/pupisevijefexujogelex.pdfIn PDF document text
    • https://inarsindbari.org/uploads/52558077846.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/93016882401.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/95506369403.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/54609671484.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f27aaacdcaaf4fb72972f0cfc7aa5934/pufaven.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/70743606999.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/42494036459.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210910_D6B2F7596D059D4F.pdfIn PDF document text
    • http://asqcert.net/files/files/20459714394.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/41982021626.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/ruzoxipifawenijitid.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/fozabonutizekirifonovej.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/lolatefedikufirezerajo.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/vapepotoromofexigukiti.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614168201d5ed---pumofufanadu.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/vamowil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=enable+gpu+debug+layers+for+gamingPDF 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_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 17764 bytes
SHA-256: 6d22561e4ba883cd44245a18024a63e67e1da1b747899fc16e7120c29725c42b
font_02_sfnt_off00011d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 11080 bytes
SHA-256: 4a37ac7178af45958777a3a67c125ad8902fac7d5080bb848eaa4c2af735bd5d