Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10784163c358c7b…

MALICIOUS

PDF

113.9 KB Created: 2021-07-27 01:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f11841d8487e89783ca938b0f3f1048 SHA-1: 0a9747b0a60c92884ac6040cf4a7f16b3fedba2b SHA-256: a10784163c358c7b5112a1338a4a20170d87154f51c0ac4be3942b76c30a520a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb031aabe5---lexir.pdf
    • http://premiercontractinginc.com/files/file/50197649299.pdf
    • https://pjkconstruction.ca/images/file/wufiwejaramidafuj.pdf
    • https://kurtoglumob.com/upload/file/jokimigegavalomijupuwas.pdf
    • https://x-software.cz/data/file/84747200831.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0349531962---baxizemugu.pdf
    • http://teechart.com/uploads/images/files/23005151588.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075df2df1b24---voxudesuredolatasube.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b74cc9f62---mobiluxutulajamijixadik.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/estukeuehk33k1jlhn9q4d91do/lezomuweka.pdf
    • https://trouver-une-ssii.com/img/pics/files/pavawumuxerepukomotiguli.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/78314237261.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pdt16ckmt7id85u0q92ohuev34/47365848741.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/getumozitudox.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/5908614739.pdf
    • http://vanguardhungary.hu/userfiles/file/zawowo.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/0ece4be92769b7017ac428bf74551508/33588356269.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/cff53610944530027fad80d3c371d841/5555997385.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5822a28bc5053a17275f326e8778fcbf/55821637823.pdf
    • http://cs-web-design.de/ablage/userfiles/files/xozuwo.pdf
    • https://onlinendttraining.net/files/jonumixapuposed.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/dab7351b13cc493eb2edbd2faeab7d01/nisow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+open+a+compustar+remote
    • 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_off0001563f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1563F 16792 bytes
font_01_sfnt_off00016e51.bin
26f1a2920f4cd272eaa6c8b8bcf3e6ff6b85b3aabef17689d80342437ef53a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E51 18888 bytes
font_02_sfnt_off0001a0a6.bin
ab1d36fe8ca5490f65e02c1e7159148407ff65ab7ff50e29ff3fc5e8e16a0344
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0A6 10572 bytes