Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0a194cdb38bb8a…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 21:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7291159fb6d4ac40b6d5c657538ded9b SHA-1: e368cae4e9762e401ac6b609df1ee00b52f661ea SHA-256: 8c0a194cdb38bb8ae89f7d09baf9d423b8cc382d5052d9d2ce5abcfc0a6ceaeb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF files as targets suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://tunapvietnam.thietbiotoviet.com/Images_upload/files/fivoduleri.pdf
    • http://tochuchoinghi.org/files/69527475805.pdf
    • http://capital96.com/userfiles/file/28112942219.pdf
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/loxuvudoge.pdf
    • http://alptw.com/images/files/45494012507.pdf
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/juwibakidavefavapowamomaj.pdf
    • https://gelblighting.com/userfiles/files/41018086441.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/63767393289.pdf
    • http://tw-sincere.com/upfiles/editor/files/wabux.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/pimakem.pdf
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/41031645224.pdf
    • http://www.contectrade.hu/fckfiles/file/devafiwokijewesukep.pdf
    • http://ipublicity.cz/data/file/maxinovalenasezolazuradob.pdf
    • http://mesterteto.hu/userfiles/file/zikegizoxepafiluvi.pdf
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/bukew.pdf
    • http://inventory-acepipe.com/images/uploads/files/gazug.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613436567ba8b---29046509248.pdf
    • http://zensushidanapoint.com/uploads/files/wemuvopa.pdf
    • http://orem.mn/uploads/files/65146462716.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161585b206c209---pexojajevomixegi.pdf
    • https://nezamirekhaseafoods.com/userfiles/file/lopesixe.pdf
    • http://www.hgekc.com/media/userfiles/file/49327786916.pdf
    • https://mygenius.ru/admin/ckfinder/userfiles/files/gidawafo.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ed647d79---logeziwaxisejokufe.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/sugefepelotofitizivosomud.pdf
    • http://gbfrjournal.org/pds/userfiles/files/27094641792.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mama+and+papa+dream+a+little
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b20c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 16792 bytes
font_01_sfnt_off0000ca23.bin
c58dfb44827f9b756333a9ce3651d72e2051e9bb5a54bbeb36b8111e97eb4b30
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 10256 bytes
font_02_sfnt_off0000e104.bin
fd1d7f2853913dbed2882e9a26721234cfab4a93e73186bc98988c572f04b134
pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 17124 bytes