Malicious PDF — malware analysis report

Static analysis result for SHA-256 8891841d1e63d4b5…

MALICIOUS

PDF

85.7 KB Created: 2021-07-16 04:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9c7aacf13de6d52db2576b280b865f3 SHA-1: 491e03d47aceddcaf2f1471edba525d1b8a3c398 SHA-256: 8891841d1e63d4b56376f07e9d02691980248a37d50c52fe7de20edc05c43469
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/td1jiof3nkucdhr6frijjj18ko/gadepozutobezemumu.pdf
    • https://hissekurban.com/resimler/files/xusin.pdf
    • https://amrapalispot.com/userfiles/file/14440070600.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c98f8ddba---63652892059.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607695a97ad76---jeruxixutolaxog.pdf
    • https://almuhja.net/ckfinder/userfiles/files/vutonoli.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07dabfd5c---papuw.pdf
    • http://reikihaus.com/clients/75291/File/56709661836.pdf
    • http://goodtraefarm.com/ckupload/files/84419060515.pdf
    • http://trunghungplastic.com/luutru/files/86833400504.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/2317190677.pdf
    • http://studiobardinisrl.com/userfiles/files/52297640267.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/bff8d23fa283143b16a565361848c307/vitopikug.pdf
    • http://haenuri.net/ckupload/files/jumigomitevas.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/89869989488.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf45884d7e2---42262122342.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f1a1681f4fbced23faf6740e46cc7556/vasuxetubizujemudiwuroni.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a8e7b70ee---lomexiwuvoz.pdf
    • https://autotronics.vn/userfiles/file/59459091397.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160adf4a15d1e8---60783967875.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa513c0a0e9---77647854854.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64b32cc052---29584741178.pdf
    • http://architects-desk.com/uploadsfile/wujasizonuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=number+4+in+latin
    • 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_off0000eecc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 16792 bytes
font_01_sfnt_off000106e3.bin
f3572bd2dd55289b5af7239e77b2dc4aab5be779563a38f6ff48be089e49f01c
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 10276 bytes
font_02_sfnt_off00011df6.bin
dc6e1e1305379a6456e208bb3cc071b7e0fd0885a9d3bd00aa64f0990ca773a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 17192 bytes