Malicious PDF — malware analysis report

Static analysis result for SHA-256 10958003358dc331…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 02:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86d73d8c118c8508a02e432a334944dc SHA-1: c2ea53b0c7a6c514d95acd16da602fff18edf4df SHA-256: 10958003358dc331cb23540a827dc6c1ef1dcab9e116641b62024ec912fb4b0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to various external sites. Several of these URLs point to compromised WordPress installations, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=t%C3%A9l%C3%A9chargement+de+foxit+pdf+reader+gratuit PDF link annotation
    • https://dalton-english.com/userfiles/file/35288371829.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/85417240313.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/vitapizutu.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/23427820650.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b4a03e345---tawutugemaboziwex.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/vovoturuwijiru.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/98817096872.pdfIn PDF document text
    • http://armanetti.com/images/12529059763.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/lijin.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a398b350d57---ripotovowasak.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/86926376698.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/vopuxupixubitemabep.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607350065d7e5---10167158499.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/82ag25f3fkpvjhvrl0p07nqqoo/vabukizurobejime.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fataxavadutumisijabuwab.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/96779876152.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/n3hra23j4qmdmf1vi14envvvk4/45718484937.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608582479e000---8653616126.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82c55f692---89062035260.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/92447527118.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/giwiveloruwax.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/xopifesufobolod.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6daab675---69524599903.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_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 11216 bytes
SHA-256: ec02fd09298a5a505fac705c82b461141e8e5160294942451ddcfd21f2a6119f
font_02_sfnt_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 20276 bytes
SHA-256: 9112ae7869381a3b7a8413d62b9e7ce4db943317398c31e77dcfb4621c60b5c3

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