Malicious PDF — malware analysis report

Static analysis result for SHA-256 8513af726e6d97fd…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 11:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a72e2ed79bf29a4aa661a833b553d1cc SHA-1: f72910cb4282d7a13f2ce62f677f42e24e84ad64 SHA-256: 8513af726e6d97fd089c1cfd2db2a20553b31fbce891c0fce7a5a118dcca4c9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, likely to obscure the final malicious destination. 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 0.9974

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://pixomot.ru/uplcv?utm_term=simplifying+and+evaluating+algebraic+expressions+worksheets PDF link annotation
    • http://gillsandgeckos.com/userfiles/file/ragexawubasupivex.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/jerigeje.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/gibapinugajigu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bf2a1583c---jokujuwakese.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c1d5c3a7f37f12027dd629d621b17613/pakuporupa.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/akgppr91k32k8hrn4t47p4q1qv/35057920992.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5c3ad82288713b76895fc9ef2d7a5ec9/57593909632.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mudo0be29i5bjfqp1kcu3cln01/62974500093.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/85075603496.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/genukutukuvo.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/65a3a3313dbefca85b513be2d1c827d3/zumemopezejarimer.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124d7d1d755a---minoxeta.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/87861112717.pdfIn PDF document text
    • https://langumeistras.lt/i/File/57567136400.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/poditobimopipix.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/55032298841.pdfIn PDF document text
    • http://deauville.ru/files/file/54166491025.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/89120490866.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/gemugaretogu.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a7496c829cc9e6f768d3f0ddb479b63e/girarenoxenuwun.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/87387063137.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/5001418402.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/sumojuwomojusufabajinaku.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/46285678253.pdfIn PDF document text
    • 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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 11844 bytes
SHA-256: 7f12dea62229076e9bb2805acca40fdd901cd52a613f6bfee40b801de635ea53
font_02_sfnt_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 17824 bytes
SHA-256: a202998928488b7e440eb563da551574d45ab89939ac0647c4781a56e2a379cd

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