Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f860480f9a2a782…

MALICIOUS

PDF

114.8 KB Created: 2021-09-04 06:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3df65ae8a15e41aab6165ac62f495489 SHA-1: a68be4ddc7f2ca35a5699205a4e4032443bfd467 SHA-256: 2f860480f9a2a7829d38027f88266d48430e34ba427e85c4ba02cbc1d57bbbbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm, with many URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, but the structure and URL analysis suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kominove-centrum.cz/media/files/file/47955765146.pdf In PDF document text
    • http://jmyhship.com//uploadfile/files/89004388565.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/19510542478.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/98093861899.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/volodukolizotowuro.pdfIn PDF document text
    • http://vipdiler.ru/files/file/povakuzuzobirinodufex.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/wogubovedivuwibadube.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd98e819d3---66399959429.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/s7ord0pk95ehie72bphjhjv2cv/poxipejerumisijuton.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607709ecc2edb---12670484189.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/36909ad8c26cb324dc18ccb12badaa89/963950771.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/93015163344.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/nisomitiz.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/bodimobitivaki.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/429f8b05ac750266031fbe8ba70c439b/xuwupid.pdfIn PDF document text
    • http://bscartridge.com/pic/rizatabazanufutemepipaj.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ap27o4b3a4ccvcki7t56rldv41/42476491211.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/kewikap.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/45554786255.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071467057b1f---gomuzowule.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833d3a19323---vakotis.pdfIn PDF document text
    • https://magatek.com/documents/file/89344344920.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2444992ad---lolutadetezexoragi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/r9tb02cqa2hc4gcjg59l3d9d53/43778366067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=medical+certificate+for+school+admission+pdfPDF 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_off00015cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF8 10880 bytes
SHA-256: a88cf4cd5606f23494ad84ab5dd064526c3161eba41c2f9ac2ebc958accd2453
font_01_sfnt_off000175e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175E0 18072 bytes
SHA-256: 0748e77c4f3048c44ed9a4284a09db38a19585b9daad86e61b41ecac40acc6a6
font_02_sfnt_off0001a535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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