Malicious PDF — malware analysis report

Static analysis result for SHA-256 3893500808aef0d2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 08:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a2791690bdf07b9a6602420a7ccc8ff SHA-1: 61919e9ff4a51c0e52fb413595f9738280037fdb SHA-256: 3893500808aef0d2bdccae6e3f2984e07e2a9a8c1ebcea7383b345640766b9ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which host further PDF files, indicating a link farm for SEO manipulation or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or credential harvesting attempt, potentially leading to further malicious content.

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 https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d112937653dc950cb1a68995de814824/14174104978.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c3767e924b39bbc9c2f34214bd8f019d/tuworugopumejetadive.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/64d4162f35e9cdeecaf2964f0f6d4ab6/7306817698.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xobojojupe.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/46978979091.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/fobomoxetasipoxu.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108302059096050.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161272f968e3d7---gulez.pdfIn PDF document text
    • https://lazerom.pro/media/file/pinemuzuvegogenavos.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/elptmeuc38c40vd2hupgkmnfrq/39249292870.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bb18c0b7f5a01fb1e234af4b873c3aa/vonapirofoza.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/lakajew.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/58148022884.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/75765926426.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/31279869789.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fkvfau17b9t8abi4npvqa0amgv/39978823172.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/zogijetosifoxefesibaf.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/72586855682.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160730ca62840e---digejavalaxiratewi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160871457b630a---susixu.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/48994216869.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109011827123276.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c90cdf5e---fajuzaxeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=classifying+triangles+worksheet+gina+wilson+answersPDF 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_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 10816 bytes
SHA-256: e6f71b56fa3dd9abe30dc25e79f105faa7018848ea5c6e099ff29ea670b5652f
font_01_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 16276 bytes
SHA-256: faba124bd21c807c1c12931e10f4665e2a406d4fa45cb2169520525f572a1e89
font_02_sfnt_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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