Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b746a3045a77aaf…

MALICIOUS

PDF

99.6 KB Created: 2021-06-26 18:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8df7b70b09e96e9686ca33e578092c74 SHA-1: 26c3dbe6b5d5fd2369a74d182a84819e990934e4 SHA-256: 6b746a3045a77aafe8266c45eba4ee335f4ed1b64cbc55763e3623df19ae33ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7159978007---67568008271.pdf
    • http://limobebe.com/userfiles/files/3914273282.pdf
    • http://teusz.pl/UserFiles/file/sipuwegavovaj.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/q9rbv2n3l7bbd9p4ketu54oig5/13485581711.pdf
    • http://automotiveenergy.cz/userfiles/file/luneziposimof.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/27318929212.pdf
    • http://poltinka.ru/userfiles/file/tubakukosobo.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/772345cb553366d4296aa91ae3d8cfc6/16323190086.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/a96d0e7699d450a99dbd2b4f55285ace/wezapef.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8da83c75987d228c23efcaf7d390d7d2/4452404007.pdf
    • https://study4student.com/cache/fck_files/file/53234328787.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1bd4c10b---23803539223.pdf
    • http://hongdanhaudio.com/luutru/files/81158632926.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/fogax.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b00a31883a6ab66bf939ad18e4bd44b8/11693541504.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085404a9108e---33032383368.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ad703553ffb---1346498565.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f48d4c7c55---27588437737.pdf
    • https://actor-conseil.com/files/file/zakiwos.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/cd0fb1789dff63b92464ad819571c198/rekufotij.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717b43dcd7e---kubajirivare.pdf
    • https://muzeumkonstancina.pl/attachments/file/jerapofavogagikibuzudaje.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/af7b9cb067bc4cae89040af8cf2bba45/35897448074.pdf
    • https://mimpiindah1.com/contents//files/26596479069.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=4+pics+one+word+level+172+answer
    • 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_off00011f30.bin
cf2893b300535222c11f6342e3dc1107580e895a56fac58217d26fa7f6c6e045
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 17932 bytes
font_01_sfnt_off00014e38.bin
833013fad95dac57c0c3247df35f91b60cd2898d727f231fcc7149be3020eadb
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E38 10764 bytes
font_02_sfnt_off00016751.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16751 16792 bytes