Malicious PDF — malware analysis report

Static analysis result for SHA-256 a242d8f7be2d1c4d…

MALICIOUS

PDF

106.5 KB Created: 2021-09-14 10:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e7b381fee757317a5086820b937092d SHA-1: 4aa27f21f827e2d74856a67225b0497a328c09ef SHA-256: a242d8f7be2d1c4de30da10644fc8e4a924924bc9aaeed3b6cfce9e22b297744
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=android+series+list
    • http://madmojo.com/fckupload/file/mekasipekibutem.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e4ccf5738de1a043a0b87d14a3ef1dbf/dozifagejasogaze.pdf
    • http://www.yevres.fr/ckfinder/userfiles/files/bexizepa.pdf
    • http://tznjl.com/userfiles/files/kukutolosimamimajemetuto.pdf
    • http://abwgulfport.com/uploads/files/11533155128.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/36043174537.pdf
    • http://richmediahouse.com/admin/uploads/file/degakumezedaporanafove.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/14785516301.pdf
    • https://dcimx.com/files/90543329237.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386c0ecd97f---pepepepuxaxabofakum.pdf
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/45131146126.pdf
    • http://profitoolinfo.ru/ckfinder/userfiles/files/10843273995.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c864fe4b13---28429363515.pdf
    • http://hycxchina.com/filespath/files/20210902014339.pdf
    • https://advance-pack.com/editor_upload/file/wivoj.pdf
    • https://efficimm.fr/userfiles/files/36016802372.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/43949627317.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133496e29d60---36403878091.pdf
    • https://nslogisticservice.com/userfiles/files/nazepeb.pdf
    • http://warmistore.com/userfiles/file/xowaxafomipagukid.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eabf01708f---dubuvakevinekasamikivaje.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/45303292443.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/mujagu.pdf
    • http://omgmediatank.com/userfiles/files/kaxelizazovakowusezejude.pdf
    • http://www.og2c.com/images/file/fagarija.pdf
    • 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_off00013e19.bin
7d56886c397c7183c4646fecfe80d24d8a64271d6263186e93a071ebe8b37eeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E19 10060 bytes
font_01_sfnt_off00015493.bin
97e83f72e1da2b921943fd0f2ed312eca100fcd868cf9f32b402865b423db486
pdf-font-stream PDF embedded font (sfnt) at offset 0x15493 18308 bytes
font_02_sfnt_off00018432.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18432 16792 bytes