Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94eeb92cadc8e70…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 03:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f9adcb7fe7ba0bbef20bda7ee5dbb4fa SHA-1: ef58b37826ebde8ab39ca21ca298d1573d9194d7 SHA-256: e94eeb92cadc8e70d91a0ac440db60cd1eaea3517db0194f12edbb55405b505a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains multiple links pointing to various websites, many of which appear to be compromised CMS upload directories. The presence of a link farm and the use of disposable hosting suggest an attempt to manipulate search engine results or distribute malicious content. The ML classifier's high confidence score further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/c5egkpuvkmcg4an31c5dmlfstt/dewuk.pdf In PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/ridapenegewuxudetukipirur.pdfIn PDF document text
    • http://annabarons.com/files/files/tubagiteloxixikamegu.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/jonorawipakemiperefox.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/12857963693.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/borunudatefomudoj.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/pikiviwaxexe.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/97163742469.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/88153965870.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/23630652319.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/kaparu.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210912025804.pdfIn PDF document text
    • http://espicycooking.com/files/file///tutudemufofugaxowox.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/42076649182.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/xumefubofamugajir.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/36b526ce368873176d718839eef19bed/nupatutidufelawujobu.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/kasivumefanolijarul.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/27540682535.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/24925474241.pdfIn PDF document text
    • http://novichiha.ru/pic/file/50502002687.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9df776a5---viwiponoj.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/72131743015.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b76685d2d---giravilejuziredelewanap.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/vewizolozemofizazobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=one+direction+this+is+us+online+free+fullPDF 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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 10536 bytes
SHA-256: ad3328f460d0a4b3c7575fb56489bd1794c411664c02393b9ddff7be940a9637
font_01_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 16980 bytes
SHA-256: 80b2a8f5fd5665fd25d9a3f6f6ff0c60bdee420c84a2bdce1d53366c1c333428
font_02_sfnt_off00011aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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