Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9b37631d09cd6a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 02:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5600e9ce9afb733d130c19f5bb789bfd SHA-1: 21123810463aa584879055050c4e8fe2ca6197df SHA-256: 4e9b37631d09cd6a37b6379f7b0f984432755d7acf9a6ff93f7f64c5be0a2ffb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=gta+v+mod+lspdfr PDF link annotation
    • https://corpeverest.com/ckfinder/userfiles/files/13614436416.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/tegamesaxe.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa81626437---83039482270.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6afd889e5ecf36f82a3c32c20e8205b8/xuzusuwigoxutiri.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/98354804863.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/leleboboxokeminun.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16117d13c2eba8---rakine.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/21095861966.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/33cc2cfe444f0d33c60102614e561572/tumaxivir.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/joridudilunudatarodaku.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021082102124373499.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nesinikapopuzujijuri.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210528150415.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/93378819236.pdfIn PDF document text
    • http://kingnature.ru/files/files/6870598665.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/tixugikuzedakavo.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/kelosabogogilagabowite.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/61551174980.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/38355286422.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zozaguziruworifupilikoni.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfcaf27a7a---55727217914.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/3jvcq2ctih0d23ipof9kmots8i/nulezupufagez.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_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 18056 bytes
SHA-256: 2307928a32b0ef36a429d7eb0a9a67aee934603efa7077c1e334b9c457d47931
font_01_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 10436 bytes
SHA-256: b54388ad54b10196fe5a7064c42a84c715f2f3248bb452cd12de217f0a13db7e

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