Malicious PDF — malware analysis report

Static analysis result for SHA-256 8786b2cd55af5b91…

MALICIOUS

PDF

91.0 KB Created: 2021-09-06 01:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 557c30c13fe2e9a72b3e50edb984649e SHA-1: f3d49c9f5c47b589de586c5945f3eee0e7e14a78 SHA-256: 8786b2cd55af5b91c30289652f1f4c1eac962dec0445595901b5dddfcdd77b9c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=arguments+against+the+death+penalty+pdf PDF link annotation
    • http://sabaispa.net/userfiles/file/maxorivo.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/kudeg.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/renuzaxorofob.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a047a4653d0---73810317840.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/80879937742.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/61767534551.pdfIn PDF document text
    • http://17njl.com/userfiles/files/bofabaforolirifowosi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5ae96a43f74c2e1ea084c8dbfb11b114/35103048962.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161129825dce57---rodekuli.pdfIn PDF document text
    • http://ranchobg.com/img/file/veseguwuxakonom.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/76450240319.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160837d4cb74cc---91741212260.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/98262860017.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8f3onkk0agc3lfrf63sa578l73/sawokuxax.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02fdb20dd3---ratatovakejerategej.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/zuropo.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/77301180789.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/dabevusixitotevuzukusot.pdfIn PDF document text
    • http://amdind.com/userfiles/file/jefowatusuxiwigitoxix.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/dufeserunoluwonagupilem.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/98727ffe91cdee84798685fa76cfd115/dometituzawiworap.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/sonuwikeko.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/46510472410.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_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 18712 bytes
SHA-256: b5df8225c980637bb1ade4436ebb6596a2ceda7414d1bfd1fa10e0541a90b703
font_01_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 11020 bytes
SHA-256: 4f218f852ecbbc39a74f604ecae5ecd372634684db39389ff0702e673d1f0c83
font_02_sfnt_off000145f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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