Malicious PDF — malware analysis report

Static analysis result for SHA-256 918ffc0f3f15c545…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 06:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b372f6b2552c957092e0045683c53f1 SHA-1: 2b5c2ac71bdd12482ae8675cd47cb9e7df127c4e SHA-256: 918ffc0f3f15c545e34038c60f7451d284b324150a717804605f4027f15723d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites, which is a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=wifi+android+app
    • http://udaybharat.in/ckfinder/userfiles/files/86541837817.pdf
    • http://yuc-fac.com/uploadfiles/20210906094607.pdf
    • http://divapharma.com/uploaded/file/77691955370.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bcddbbdcd---zekajiretaxuf.pdf
    • http://abwva.com/uploads/files/bemofigizolepurob.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/71090137261.pdf
    • http://autowassenindex.nl/images/uploads/tikoruludiliwusonukoli.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d10fbb95d---93423367628.pdf
    • https://digicpictures.com/downloads/10802907769.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3a56f81726045b7f04908040522344bb/80860132683.pdf
    • http://puebloexec.com/userfiles/file/papumiketoxoxerawiwesofo.pdf
    • http://rydelko.pl/userfiles/file/larifozeburupabofobo.pdf
    • http://daiichilogistics.com/uploads/news_file/93077400198.pdf
    • https://campfun.myhost888.com/upload/ckeditor/files/6454728142.pdf
    • http://annamsaigonlaw.com/upload/files/90954117301.pdf
    • http://pooq-design.com/app/webroot/fckfiles/file/95780102778.pdf
    • http://brandiassociati.it/userfiles/file/milukukelabubebepogoke.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed53d344e---derafotopededizexiza.pdf
    • http://mintaialuminum.com/d/files/53320695524.pdf
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/takixebaminape.pdf
    • http://southerncross-ex.com/images/blog/file/16472612771.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_off0000ead3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 16792 bytes
font_01_sfnt_off000102ea.bin
2bb256835a6033e15c4dfc43cc32b3c214d40501375e46e428583226a2e49dd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 10040 bytes
font_02_sfnt_off0001193b.bin
79a70b1837f4a54ffda380c1f734856e257788d3eaa76e6651e39203349b6fcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 17180 bytes

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