Malicious PDF — malware analysis report

Static analysis result for SHA-256 27426f306b830fd0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 22:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 707908683ca5a55588da20832c50f13e SHA-1: b6b7945eabf62c4373498945673de683c8c7d25c SHA-256: 27426f306b830fd0394138c1ab849e9b234b51705e788404ab7a980d56c3935e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The presence of numerous external URIs and a link farm indicates a phishing or social engineering lure to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.toptehnik.si/images/kujasaloxiloxeratagolonu.pdf In PDF document text
    • https://essuances.com/ckfinder/userfiles/files/xewekigibunalo.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/gefusotuvo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/654f73da143040ec9b1d89ff7536fd91/xogodufawu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161139e5b1c4fe---38460493684.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/c9shld727v3r2os1ibonijudn7/26101524956.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/07623529a2bc51e36764f92e00dbae7f/39944162611.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160743ffc8303a---52141662320.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/55443645975.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/nobasotuwoguwijufoxu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f7499f08beba46719dc4553329e42d0f/46732441900.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/39394588484.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/78080379749.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6fc03389a---sezevosateseduwamotej.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/33375058378.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0a000d2abea7bf22a626680069237e49/79403629547.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f1eaca163b7---kunatitisudexoxolajugane.pdfIn PDF document text
    • http://vanhacollection.com/images/files/zapabivejur.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e9ff78dd63dcd1c52865314e1bca5b10/nomalexuvo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2fc2c9d11---8368985512.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0570b2a6c2e324642b9e59cd03989cbc/44733408343.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/75846797993.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210901132143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=canon+lide+110+pdf+scanner+driverPDF 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_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 18828 bytes
SHA-256: 82cc20f1268d247e4f790685f8a5b559b63c9d292a1fdab2e453735fee844d6d
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 10788 bytes
SHA-256: 97cb6338d71df7989a8d52156191799d5ca4e0cae18d0caab2fd13b0068144eb

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