Malicious PDF — malware analysis report

Static analysis result for SHA-256 840ee746d069ef08…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 01:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae0b329005bcf8198c341d097e8f253a SHA-1: 13d06aef58fce84736f3ca57c97a7e7280cd3b5c SHA-256: 840ee746d069ef08031c4dede948253e9ee33121ded9710013c3545717a198a7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to other malicious or SEO-manipulated content. The presence of ClamAV detection and ML classifier flagging strongly suggests malicious intent, likely to distribute further payloads or engage in phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=medical+histology+by+laiq+hussain+6th+edition+pdf+download PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f98b6b071---rogapetanal.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8dd3084c707f6773d82a8db3f325a51b/33942506540.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/kuputarepadimujig.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/5255310851.pdfIn PDF document text
    • http://ibb-online.ru/f/file/39823176213.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/padejogofusuzagero.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/nurilovod.pdfIn PDF document text
    • https://asiahealth.standrewsdentalsurgeons.com/ckfinder/userfiles/files/luvufitavikemifesolepomo.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/zidaros.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/xejudagemiruxiwa.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/41736287659.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1e5dc902---lupenelepuba.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/313f94d9a3e5639be12766c66e75d3fd/17534569045.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/vefupitinofefuneboge.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/rilupidi.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109191623375306.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/vejeledusevi.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/36219311589.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/29073499990.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/85079153779.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/67178732190.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/tawakefaralusabawelowateb.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/damituvunigabadinorikov.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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 18820 bytes
SHA-256: 89d66278e2f32f96c3699e05d469dc7b172b2aa553ea986c637c4a774c52645e
font_02_sfnt_off00012591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 11544 bytes
SHA-256: 60f05a2fb42441b92e49e8d35825febe5e977d4ce78e16bdad227632db29b76b

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