Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa21a6261bf6795e…

MALICIOUS

PDF

79.4 KB Created: 2021-08-06 14:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 594f8c4f8b912d84d684919d2493e959 SHA-1: 3a9cd95d7311d548d23cec02f2a8aba5291d0d09 SHA-256: fa21a6261bf6795e3e0cd4af24092351a1397d92fbbb2e05885d1c1ce331d230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hytechplus.com/userfiles/file/tazalanoxu.pdf In PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/r5f3soluidisuh63m97rdala80/kafigaguxekivipigiralatum.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/cadd0060a932f02f12e38d729206269e/21131457299.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/gobaduxidi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1c34cb5e851f6aee102304b9201fe65e/jonupipopiwuwarurufix.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/96946533478.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ceb85f78459c7bacc9437dd70b4c9b8b/85772238367.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/g3rgene0rm7aflslb79hf5in9r/fumuzoraduxup.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/87602269709.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea410b44c---60261113102.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983bae0b7d---kitafikogaxugafowu.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/56441949853.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/zoduxe.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070de24277ad---2150645095.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7ecba52c0da48e9950d94a308d3996b/13678047959.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/34338924090.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/409c0c2fc6de32fbb1ad0fff0d0d11a7/poriponoxatedide.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/9h3ih5pi38o6i4vhqdk50mgktm/27933372920.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cfs6k10c0gm7pmq2sgsuou76q/mixanagejomarasibule.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/28485713341.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/9783723319.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd35810ba---vilulabigijovor.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/faburifaturomafasej.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/72992836855.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/9988916312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=i+got+rhythm+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_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 18652 bytes
SHA-256: 645d68e1cd7334bd5ef0a8e830b5875860a088a56b1a9acdb03c6e8096f5e2a8
font_02_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 10304 bytes
SHA-256: 20d177682be5dbac2ff11e6273a83510abc89ad10606f9111e4170894f917102