Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aade8fc0de2fe98…

MALICIOUS

PDF

109.6 KB Created: 2021-09-16 00:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3bec0dcd49d97348175c90016a8ca0c SHA-1: a7df6ce007ca8d18f1aa551a025536132d4cfb74 SHA-256: 8aade8fc0de2fe9843af6b21642caced2fd001b29e10d280cbbd59b75ea5b438
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://kiofruits.com/admin/uploads/files/96372118141.pdf In PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/jotatiwituxijawuvil.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/88891701909.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/47488651364.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kd4olehemf06hvh7f0tijaqgl9/zovozexegujapirakol.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/54097038755.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/64805056026.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161425ece95f3c---zodigulokepewamakivu.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/datidojotepotezibuxa.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/88569299714.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/37348772962.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/tukemepenek.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d8b89476cf64127ede9c5db622ec0ec4/siretobenavijezilesisofub.pdfIn PDF document text
    • http://prota.ru/upload/files/77229207470.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/kexokagirojudu.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/tuxoxizemukakitukuzi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5e8d14b1---49360401202.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002aa832e7---94060802379.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/54839959268.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/14493702644.pdfIn PDF document text
    • http://byecook.com/ckupload/files/56589607753.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/sebopelejapisom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=persona+4+golden+quest+21PDF 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_off00014533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14533 10828 bytes
SHA-256: 512513ea4b457008a1c1a9c6792838acfed07e92f326e56e2a29446426fb5767
font_01_sfnt_off00015def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEF 19372 bytes
SHA-256: 781eafcbc6a6f3546a03084ac44469e22c0f4bb1ac82aa939437b25048b50774
font_02_sfnt_off000190ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.