Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed716ffd0c83c29…

MALICIOUS

PDF

70.9 KB Created: 2021-09-21 05:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f24710fc68bce179ec0ecf1f41b44a41 SHA-1: 553b9858e7bdf3a4693055f5a62c3a6d8799f17b SHA-256: aed716ffd0c83c299dbe2a4824acdb37e0832b86aaabaadbfb38afd18b9337af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=free+skins+generator+ps4 PDF link annotation
    • http://mastera-mix.ru/ckfinder/userfiles/files/37091450549.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/30191412492.pdfIn PDF document text
    • http://dkind.net/userData/board/file/55395747611.pdfIn PDF document text
    • http://delve-cr.com/uploads/raretemiseporileninujipup.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6367201195.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/79153338340.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/rijomupis.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/lamowapuxivobik.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/pemigebarapar.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/pagijebepoxonogut.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bucfhbgdrd9bj8dbq8jhulj2is/purazokutof.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/deliteril.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/64223694817.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/97471786631.pdfIn PDF document text
    • https://podimercrm.com/img/files/ludegetedugejoxew.pdfIn PDF document text
    • http://splogservice.ru/content/file/mured.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/97995355643.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/84331964011.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/81096168337.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375ba2ab90e---jejejorupiwimi.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/68750312332.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nq4ge45fooa554107urbe0re8j/kikelovupotow.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/38628975595.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161493429f0ac9---zezopipujanoda.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_off0000b6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E4 15276 bytes
SHA-256: 8dc4c6696cfe5dad0284ec3bcfbd290ae6f2ccc2859340072679c889ce453d81
font_01_sfnt_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 10528 bytes
SHA-256: 4985ad9c2a78e7c486a2caafeef1c3360c09108ee1ce91d567b0831d7b1d8071
font_02_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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