Malicious PDF — malware analysis report

Static analysis result for SHA-256 b868c7e706c90610…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 20:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7ab895345d1224e7e2d2761d1c6b74b6 SHA-1: 4559678f01e09bbb13e8492c58666ef5c4587ab2 SHA-256: b868c7e706c90610c2a1d0a51163225927bbf9bab12589ecd78a5db3b7795732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of external URI heuristics and link farm indicators suggests the document's primary purpose is to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=emily+dickinson+much+madness+is+divinest+sense PDF link annotation
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5676b937---64111038745.pdfIn PDF document text
    • https://binhvi.com/upload/files/zavag.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/39843757343.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/manegupulawoni.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021092302284780554.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/98628272460.pdfIn PDF document text
    • http://levotst.com/uploads/files/85967534076.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/13193486080.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141e92878b2d---62835536163.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/34496487905.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/70573460794.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d893b88742---7555046174.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/wesogoxepawi.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/wikifexizolexi.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/68271980322.pdfIn PDF document text
    • https://projetovm.com/uploads/files/rosav.pdfIn PDF document text
    • http://baove24h.info/upload/files/gorag.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/13538922550.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417a3c26652---jaxerojivozosareporawupew.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/93483077404.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/710305378.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/xadasurad.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/zomanavutapeligutepuzu.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/63314263662.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_off0000b11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11D 10888 bytes
SHA-256: b6225091bb188c1941b2270de1f59ace2af5c94a44cbc3f591f230be97eed608
font_01_sfnt_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 17088 bytes
SHA-256: 8fe1da469aa805f10fe3b68433a94d984b23722affea1958793a0157778c98c7