Malicious PDF — malware analysis report

Static analysis result for SHA-256 836391d0f09812cd…

MALICIOUS

PDF

86.5 KB Created: 2021-09-03 17:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9dea833f9b0ca8a5ee369092bf8a3cfc SHA-1: 5a5e09e43d38e161d1ab9ada1bf7b7384caa4b97 SHA-256: 836391d0f09812cdc96006dbf2c72143c22b97191d3a3d3556670d693d8b641a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The primary attack pattern involves luring users through a potentially spearphished attachment to a document that redirects them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=maariful+quran+english+pdf+vol+1 PDF link annotation
    • https://kabelkyaobuv.sk/editor_uploads/files/kafasaki.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/84235021698.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/39162870a389c1e1f3f9d9dc04773dac/84793356096.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2aafabbd7---xaberivebizesumu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1a8156dc4cd8c6dfcaa950c3131156db/42485393019.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1136ce09ed9ebecb10887b6f85271008/42581468911.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/sulejoxezojido.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2338ae30a---44031455519.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/xologagefololorif.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/mubupunuvilaxekuwu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d003a75408---jogimabanidife.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bff506c02---15301753409.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/83a697620254f0569f706c25efab827c/tulix.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/2830734756.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dafae33ff3c---85583157723.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b433612d1---mejorazukitorumowof.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/fa20e15a8dfaece341c1404353202dd7/37980359604.pdfIn PDF document text
    • http://rotang.net/userfiles/file/rozewegilitimefujala.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624147299.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0cb1fe0b0898768d756a8d500b22001c/jamumaneditemowuxusewero.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/tadozamimami.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/76453023491.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/worabenaw.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_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 11036 bytes
SHA-256: 115ec0aecee161e12fd36291baf5d5c48639ce098c3c19a40dde4386dc61b54a
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 17116 bytes
SHA-256: d658b617eb1eeb4617c96b2037966d215e3b66795847ef729bfc6cbad44a1535

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