Malicious PDF — malware analysis report

Static analysis result for SHA-256 12956631fadf8fa0…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 22:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9cf226dd21c424d07cf4ee2705ea3b7 SHA-1: b1e7d0b5a03646e5b2cd330fa7768cdf5f55cb5d SHA-256: 12956631fadf8fa090dc3b2599f8fccfcd87cc1ba9b6f064ca81f235149c0124
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 http://h04ydivan.ru/userfiles/file/23668936152.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/sugaworubarived.pdf
    • http://shopcode.ru/uploads/file/73593106826.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/xajivupolamipataduk.pdf
    • https://b2b-intelligence.it/uploads/file/99635446170.pdf
    • http://namjapizza.com/app/webroot/files/sozewuzisuzovixonebuguket.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843a69326d---tomofiwilifize.pdf
    • https://digireg.es/upload/xobararesupivejawabipator.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1fe3ca29e808ccbc16c54bbb51bebcf8/52694734264.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bf4e50f10c35a5169a0ff7ca47d11e36/juluwugofifitidefun.pdf
    • https://truckforceone.com/upload/editor/file/9995650975.pdf
    • http://studiopol.it/userfiles/files/17488271191.pdf
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/57335787280.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/addd5d880c1b2315aef66650b84cd593/gugabaxiradadedogumi.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607568f547bb5---61186942156.pdf
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/turirope.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4a7b1f5di3pvcs6faa9vkj6hre/45262328999.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d2f9d1f87---27732357632.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/wagebel.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a180a96414b---61856392900.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bgen2396auc9mlvb00k7i1bsq4/gekewufufevafif.pdf
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/62360157622.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f8ea338a---gitel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fractura+de+tercio+distal+de+radio+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_off0000b7b6.bin
c4bbb1556fdabfc41d51b69ec4e21352b4ffd5f9408a14ef68a8b63064abfbd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B6 10588 bytes
font_01_sfnt_off0000d004.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD004 16792 bytes
font_02_sfnt_off0000e816.bin
cdf3d6c9937b27b3553e0aaee1be293ec08839c4a58fc207392ddf4d30b3e085
pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 16220 bytes