Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fb6e59bd91c539…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 19:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c30d0de13f3af18f9e8ed2802e7d879 SHA-1: 2bd4438a2b447b66349e2549c8590c5288a27291 SHA-256: 94fb6e59bd91c53961c3b63b3fd9fe0b4fca059c7f8705bf466a1af85ad23846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://oniceh.ru/uplcv?utm_term=samsung+dvm+service+manual PDF link annotation
    • http://nacyc.jp/Upload/file/fajibivifu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f447bbe6bb1f180c333ad2b77209d9f1/20072337757.pdfIn PDF document text
    • http://rld-carbon.ru/file/zulasegokujizebolorevi.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/44a65daae7fadca3a5ecc2c24542b80d/81340750472.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/rolemigalazuzojijoxivuduv.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/jarebudix.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/bitenapenuluk.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/16544108157.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/76445320500.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/6188369318.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/11680290022.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/zinegad.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626701181.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d17ef38db---42883769225.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/11528127708.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/6tsna172nkhatr6p0ufe7f3cpc/21313967940.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086563a89c4a---rexenogisifosusinike.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/tulejupawatubuke.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/46583414496.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c2d167b2---92205231640.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/21e2acffe9e532b579c12072c71ac4d4/45069398178.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/fapafekepitenifowaxosata.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a350a4be4db---xunesazefitobigamiwovafu.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/64190775989.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/fewelereburuda.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_off0000bba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA9 10736 bytes
SHA-256: 750a7c81f961be4c8828d0af0caf00485df83e5797223b7a59ef755c5d7a097a
font_01_sfnt_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 17000 bytes
SHA-256: cec99c8fe9a9ddc55be005fa931687a5d75c1f1b44fa1f1bbff18661d6ef22fc
font_02_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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