Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f08e0bb6e8b9a78…

MALICIOUS

PDF

98.6 KB Created: 2021-07-08 10:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92867680dc6526b9cd7a44a2e3a97c03 SHA-1: 622bdb0a020814856b2cbbe66b63363e142503e0 SHA-256: 9f08e0bb6e8b9a782f4a350bf607a5219f1433e03bbd0fba921cbe8138d20e5c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/616a08dfea34d777a6a3273660fb933a/gutitipowetagagapu.pdf
    • https://songhong.info/userfiles/file/54465885877.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d72ccd227---26313388648.pdf
    • https://citrasas.com/ckfinder/userfiles/files/xodomemizasuxijuzot.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8aa180923a4f61af4502e902484ed915/sexasepoviked.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7aaa98f34922d2072bc6214650910c76/meduzevilifa.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ffs4v1q6mdooeipq9cs9vv9bh3/vunujovuseliniborum.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/dugudixesowagot.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d73b4fea---noparesizubixinedojasa.pdf
    • https://thinkhigh-tech.com/d/files/zuzexuj.pdf
    • https://pioneerlift.com/upfiles/editor/files/kepogipazojomatimidufebiz.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a416fd1722f---salamugemilofa.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/eirav6vjgjiv3a8ut1aeaom1nc/mikemebak.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a464ba87468---85429913656.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/mrgdik9lal00avjfq198sjclg7/kakusepotesixanelusej.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jfheqtk7mmb8qaoshl2kcsg043/zajinodapegipomero.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c082969c6---jawusulaxikogegalijuf.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6b383d4ec---59766713317.pdf
    • http://appletechsolutions.com/userfiles/file/34845454747.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160baf96382af0---97392556039.pdf
    • http://tofuyatogo.com/uploads/files/magivemolek.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8d059598e48a0e0e875eb850612131e5/1986317930.pdf
    • http://ahcxdq.com/uploads/file/300821542312.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e2bde74e527d577798f1bf934b68d1b6/xoguxa.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/zepatu.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e57d825aa---juvewevoso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+tell+if+salmon+is+done
    • 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_off00011f71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16792 bytes
font_01_sfnt_off00013783.bin
1580553051c96514e73ee7d99ff76b051624311ad0dbc9605b2f38591e8124c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13783 17656 bytes
font_02_sfnt_off00016513.bin
168e392860bccd22a49d8b5c371ad2215d7bbc2cd8077e03678b518c29caf30c
pdf-font-stream PDF embedded font (sfnt) at offset 0x16513 10492 bytes