Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46e874966e1c422…

MALICIOUS

PDF

92.2 KB Created: 2021-06-28 14:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa2679428774f545df89f03dd4b3cc2f SHA-1: 91d1ad63fa4dc27c4bafbfb17fab828d9feca449 SHA-256: b46e874966e1c4229f13544eb775a9c829d1088a62bf8ca3dfb27cd56456b3a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are intended to redirect users, likely to phishing sites or for malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gbm3vb24qcqodkdnkpbvo7l61n/nixelavasusilukoputosoma.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973f9b0d920---58421173584.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aa5c937e7---xifanexom.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8evk5pak9beineiolmisfoj7kp/43217030598.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609655c8517fb---61551207630.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kakatovizexad.pdf
    • http://ketoanantamhcm.com/uploads/files/jexisunutopat.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/166db711068a52733368f4ab3abd2591/17750591615.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b60ebb01---topusixegupevudopizatemaf.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mtq51rbe2rl64tg7n4dd9nu0dq/61922406586.pdf
    • http://www.sport-konyv.hu/userfiles/file/50293712455.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b6167d85---87715887266.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dc9f027dc---27105489236.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d4761d16caeee93904e778c8b2486590/lozubemawuzixasumowegu.pdf
    • https://emilline.dk/ckfinder/userfiles/files/rodobamelojonalabizuline.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7e4ac20c---43764415957.pdf
    • http://aj-logistics.com/stock/userfiles/file/duzujiwiwumomokege.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3031cd312---56172857693.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c124ac075a8---sukojuxugutipipunujaz.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7d834c229fc1b47ea48f603de6ee4adb/wigunavasediriwovijokoxe.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c3cb4cabe---matufutipuv.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/b80e59b61c1320ba2e32e4b1a6e83570/7278313338.pdf
    • http://tgtech-auto.com/userfiles/file/gegab.pdf
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/vumularimomaguvo.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b514904877aa25576f96aab5b166b87a/69501334394.pdf
    • http://clarksville.net/wysiwygfiles/file/22985098185.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=decision+tree+solved+examples
    • 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_off00010118.bin
df737f31f99b72b7508cc063ccc7acb8e3514a57f7ed1ebc33d7fb82d3751175
pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 10844 bytes
font_01_sfnt_off00011a2a.bin
3bab7db98181acb45d5813193b3f82f701fde0529455369a25fd029f15970479
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 17976 bytes
font_02_sfnt_off00014982.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14982 16792 bytes