Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ed531d42f805c8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 01:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70aeab088bf7eb5f2b75282acb6827c5 SHA-1: d79be7f2629ffa327d43073825b166f6c8bbbb40 SHA-256: 68ed531d42f805c825f4dfb0366ad12bfcc6ce38a2dc0491ed8496b2a251a9f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs hosted on compromised CMS upload directories and disposable hosting, indicating an attempt to redirect users to malicious content. The presence of these links suggests the primary goal is to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://xn--l3cbpp3gh4a5g5c.com/userfiles/files/wufofebavajevux.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5f3753612e259e4424265ee2c58712ec/biwerit.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/7224f37a874921b153e225461ba249ed/gixumisefutezejisovik.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f2249bcf---bopepinutujidujiduxatu.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/guxovebu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d649c376---3350287116.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160827d77772a2---40455450387.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/bafepenedopete.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/85883663327.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80e7c6efa---22391829199.pdfIn PDF document text
    • https://tempegaring.com/contents/files/sufogitixovigubasukuvoxi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a766ed4cf88---24902035029.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/36705103443.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3352a16e4bf2148e80522c546691bb5c/476065360.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/28000770663.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210814030257.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/77467994700.pdfIn PDF document text
    • http://jar-ted.pl/file/38534137101.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/24650588394.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/36846513716.pdfIn PDF document text
    • http://cjatkinson.com/userimages/60880696530.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f6450da7a---3154981120.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/jakuxikubuvilobor.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e1de2f9f---ledowutopebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=area+and+perimeter+of+a+triangle+worksheetPDF 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_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 11104 bytes
SHA-256: c05257e103178483da0ba3e8474aaffb3292e11671f1af37674077de0670e0c4
font_01_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 18116 bytes
SHA-256: ed1c4d8aebe7a9296340ad089c55758c420da8083583e3e04088cc475b01e3bd
font_02_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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