Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0430b08faa1324…

MALICIOUS

PDF

88.6 KB Created: 2021-07-01 19:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 203e66258fd7f48234b2295f184930ed SHA-1: 8051852a1924678e393834141d79ee1c684069e2 SHA-256: 6f0430b08faa132402bdd2823fafd9d5731ec96e2fff5efa0ad814fa8657a361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, with a high ML score. It contains numerous external URIs and links pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure itself is also noted as having duplicate object bodies, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=sensory+receptors+found+in+the+dermis+of+the+skin PDF link annotation
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c262e7d8421---pogagemitika.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/58ee345a44ad4e962d40427a07129531/38583191650.pdfIn PDF document text
    • http://adveotec.com/img/file/20832409111.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/pemopo.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/38a7d7b54002e6d40b43e9969bf1826e/pozilivedofo.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5uqee59ns93le4fjl3qhrif5m3/tujawuvuwuwikutopulizozu.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/65072282626.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/463daf1f290a805ea9b85024a3ad6723/75405502918.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/qgouejc1qggpmeq3k67m9ardc7/loferor.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/dotap.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6b130dbdddbca6e275cfcd6a692d1204/fifuzivazepezeletofulufa.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/36184f09e346922caaa1ffd77ed08075/94807370704.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160797104ae549---65259983266.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/g8bie4fi1d4rji9toknlr0v559/4745693391.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c86cdf94c00b576cb3fd0617cb4b3d43/92554968915.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/magom.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca621d170a---ferepijikagosutune.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/wominuzenabibuxugeze.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3212958e4d01acdcf56b6ab6d0f1e8f9/59996413707.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/gjaat0bqiea98im8ic9cl5tlf9/45589097423.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/73e5a9497e1588cd47da2fe07b4a85b8/tebinoviwoparulavaduv.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/42ffa27c2cd0e6c0786adf8eeece7013/woletagoxavolifutogukiju.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ujgrbgkqv8ncbla76i5553gbka/72937603035.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a36745e9af6---56462780120.pdfIn PDF document text
    • 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_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 18116 bytes
SHA-256: 35921ddb7812e7b4084e3605eae8b4759746204915c5097bca2b0b6caf48d30b
font_01_sfnt_off000122e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E9 11056 bytes
SHA-256: c3229b544008935b8e67577a2cf56bf2bc3ea22c337b128bc5a22aa42e67eb63
font_02_sfnt_off00013c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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