Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb4901615679db5…

MALICIOUS

PDF

80.3 KB Created: 2021-07-04 06:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b1850a5a8950842f42734c46a4e173e3 SHA-1: d2b611bdbb084f99c1928a048716db1607e34cae SHA-256: 5fb4901615679db5e6e36868ca8208f2025672447a2683ff78b7cecfbf807874
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 contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites utilizing the FormCraft plugin for file uploads. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d795347be---72348148806.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468f107de9---52258782696.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c973469d0de---suliwo.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/5868755531.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ecdhf3vpg8qrtnuakqn4ofj5hm/45478185789.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/5ae040703fa61df217a1d1b22de6f8ea/61211252578.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/79402369940.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/buwexiweviwodelos.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/88867620533.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/tejotugazefaxoxomurabol.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/148e1f43b1e4186608733eed4821af0d/sebebelonibidufibidefe.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c684e3c038fb749abe6cf1678c10d73d/79425826200.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842fc91c700---29626729066.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67e18ef1f---junelobozufa.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/no8aii0v7okk8a0d2k7tbtb32o/wodesupetaxefimegajosigop.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d775bee1a5e---16350395051.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa1c805ff5---84249734832.pdfIn PDF document text
    • https://patc.fr/imagesfile/kazinuzogirokerigenad.pdfIn PDF document text
    • http://haphadoor.com/upload/files/97578005156.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d6ca3bb2f82c75bda17593aad614a072/kuwevewejokuf.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836447911e9---diwumubibojepilawin.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/62016354522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=agreed+ways+of+working+for+reporting+any+confrontationsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 11020 bytes
SHA-256: b8c176ff606db9e8a0589968a28c7294f1e2c7a23b36d80ebeb7b0c8c0f0ec98
font_01_sfnt_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 16052 bytes
SHA-256: a8f78fca62c41dc033bf9bb90c849a5b37899843f70079e79b4e1252bdfb2ad7
font_02_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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