Malicious PDF — malware analysis report

Static analysis result for SHA-256 761d30ae6e49d3b2…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 05:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fc65a91d52663ed5da5b4abb33ac463d SHA-1: 358a171d755725a50c9656e018f7a71d22bf178d SHA-256: 761d30ae6e49d3b2b1d5cf2e671d57dd236e07d8019e7b5aff84583ba1d265ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting this assessment. No scripts were extracted, but the presence of external links implies the PDF's purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=personal+pronouns+lesson+pdf PDF link annotation
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/33a515499fee662f0ea2b13d2bcebac2/45386196707.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/gemuluvoj.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/52613711824.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53642605364.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/15030293387.pdfIn PDF document text
    • http://btfa.tw/upload/files/29003728906.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e124767d1cd01313d36a56fe9417bd7c/11815108191.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5ee85a432ee250eb14a55a649e2c7000/dabafupisesowomedux.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/tejenixasejujemuxetij.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/52943016509.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a6169e1dc4fb5712e6712a36dc8ef445/65499133559.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9ad24aa3e---62306422924.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c71cb338---xojafelibonuxu.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/zuduxes.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060104452155.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/40e8b44d3c7be0781047f3c08db22642/91285389679.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/fikapad.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/maroxomisemu.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/sevitikapivimegubizeg.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/tevawebefolig.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/pqv5c10oub5lcdcics9oakuvlo/duresukovogeposaduxexawob.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/rirs70dguc0p33vdi2rvplpemm/zetos.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///totalufat.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_off0000cdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 16980 bytes
SHA-256: ef773c385ee9c0dbddf5cd318bfd93143a0ba1e8af9c3b5c08b66c05cabf2fae
font_01_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 10404 bytes
SHA-256: 9ffc907ed3462a95edb86efb4f9d6e1c9379575cbbdcbd9a01a85d8a3c8405bf

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