Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c406dcde718c528…

MALICIOUS

PDF

94.1 KB Created: 2021-07-06 23:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb50441edc15c25b80c7e9766593aa26 SHA-1: 0978a7cacae1971ad6eef185d8ef2e66d80ed944 SHA-256: 8c406dcde718c528ab1ec152243d81f19b61234dd24d44e3d5dbb9867f0ac344
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to numerous external websites, many of which appear to be compromised WordPress installations. The primary goal seems to be to lead users to malicious or phishing content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pistant.ru/uplcv?utm_term=best+final+year+projects+for+computer+science+students
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e131c169a22---94818962208.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/645c28450e1d4da312fc2b8f3661b761/58187885182.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6906e468c47beda1d26019a8d188cdc8/74343280624.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c615031b923---sarabirubapebirop.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85dd2507d2---85490432471.pdf
    • https://lukili.ch/UserFiles/files/64643280233.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6959fda5---66430346482.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/lazunobogumozakewal.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/40522001649.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607675805575c---ralepaborilewekekeraros.pdf
    • https://tenfci.org/userfiles/file/55306178824.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/33a515499fee662f0ea2b13d2bcebac2/45386196707.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c30381ca79---25303642379.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087101ca68be---gejurolobekugewuli.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e5e056d6---25235310303.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d1d9db770a8597d89a1bcd1d6dca502a/8063171837.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/af3d4ae7ff9cbff6fd49b331e316fd20/mexidez.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb091d491f---kekulifoxisavusojebu.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dff07323c---modav.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16082252267111---rugidivefufepikumuworoji.pdf
    • http://dd-eng.com/files/files/51561724862.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7936a5b37---fufifageni.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a18991d5955---57569845044.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001089e.bin
7807c82e85c505864d6b26c94bad7564e5c6147c4a1c234025b32ae05238f115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 17784 bytes
font_01_sfnt_off0001368e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1368E 16792 bytes
font_02_sfnt_off00014ea5.bin
08d19d89cfd06a72bb85ea1fa320bea4e73d2a1bc3b5672c656744039102002e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA5 11180 bytes

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