Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18131e9bea39e51…

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 00:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0630e762c1a4253eb5d33f06ee485565 SHA-1: 2ea74f673372bec0a152c259eae0cf102d0225f5 SHA-256: f18131e9bea39e51199a9f179f87f3adec6f25775dba88352f5562f77ae2e3d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics further supports the attack pattern of directing users to external resources.

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://gamax-moto.cz/data/dokumenty/58985789062.pdf In PDF document text
    • http://clean-ecology.com/Upload/files/bijejisivatifujazebex.pdfIn PDF document text
    • https://auto826.com/uploads/files/34230171333.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/xojaba.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/34129406639.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/200226571644.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9a8ef1488---29831187219.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/9834185208.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/soxiwiv.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/mejinowapumipavekobaxu.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/4089763847.pdfIn PDF document text
    • http://ha-sine.com/d/files/94445986448.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/40150873713.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/subifudulufufidizasa.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88168ba67---105470296.pdfIn PDF document text
    • https://best-label.com/upload/files/wavivakekagezovusesov.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7bfe877bf71a76300459a6e080494c1c/38297111343.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/13aa142cb39c9808678d06e7d80999b4/18500218576.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/vaduwigigudagotifuz.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fibatogakalasaniselotexu.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/xerukonizogevawisu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8d74bfb7---7211838728.pdfIn PDF document text
    • http://stl-hk.net/userfiles/91303476066.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/97090675704.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/mogaxudizarusidesobutumis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+limba+romana+pe+telefonPDF 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_off0000c746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC746 20808 bytes
SHA-256: 755f9cf341d3a1bf6b22b0409b9b5ba9ebaf73e3e842a7896665292f7373acd0
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 10716 bytes
SHA-256: d2ba7fea055f9c217f5d58fbcea3963569c82d3d7864918d25752a2a38bb8f86
font_02_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1