Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4583bdf54bc294…

MALICIOUS

PDF

104.9 KB Created: 2021-06-26 10:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1bceee120d0dfae8ee9942cb63677936 SHA-1: 9bc48777cf1abd5565a588470224fad3b66a2bc3 SHA-256: 0e4583bdf54bc29429ebf1c1ed18521b5e33f4cb97ef004ff19debf2d7dccb6d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and a high number of links per host indicates a deliberate effort to obscure the final destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/vvn55butp0aq9qps6og3ne0hgc/71858576118.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/023357672f554bd6768b1feef96810c7/75071157828.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727afc62af5---5859700033.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sucd59jret5ui3lqqosknd42m3/95235537266.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/memadexiposevigik.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076df28140f7---woxutirovibevomimenovuka.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/880be9db6fe7ef62a35707c54a555140/23240925835.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e3142615413b7c482790fc49f90fd3ce/42915437210.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160797e6c50cdd---zelokavuxubuxajuwuwise.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qg6ggvu0i527fs6rgku3tqodq6/50374861362.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/01e5e20c18e40f4777e52bbc765cbd7e/lalikefamusuzigezelejomor.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/mamaje.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/70365792205.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/75502e7db8cce4b61a3992b082b591d4/lunuvotelemivin.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/68036881439.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca2b8adbf---temofodugirerudigu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb6c10fe4---63661138579.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/16740592233.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/29a3e2ebefef30f96547236050bb4d2a/nimetadaw.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/n87sadkeh4ui3sbco3ohu3q4e0/56455817542.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f6f4b18a19191bda1a853be8ae51e977/nosur.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094da514b251---59179754783.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/3088252321.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1l7go3qj5shcb9scsmskmn76e1/74653957989.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1480a9bd5aa724189a7cf1446cbe41df/85136893048.pdfIn PDF document text
    • http://abnicum.com/files/file/fedazujasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=entire+naruto+series+in+orderPDF 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_off00013a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A03 17508 bytes
SHA-256: a9cab90e168b70b2916a533a8807eff45c8d247c0edb79dfd432000de5c0e620
font_01_sfnt_off000166c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166C4 10276 bytes
SHA-256: 5ef8790f4d572b8ec1fc53bd9d799398f0f58532849e8da21d76c537fd4e1988
font_02_sfnt_off00017e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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