Malicious PDF — malware analysis report

Static analysis result for SHA-256 212578b3f884488f…

MALICIOUS

PDF

94.7 KB Created: 2021-06-27 00:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99a64746906be571de28fcb1782088e7 SHA-1: 89f9c37d78445ecd6fe7e81482dbc3fe555c05dc SHA-256: 212578b3f884488f7677b7a6039c4880a845b3a9d3b0795317962bbcdc2a974b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073848466c03---6117733727.pdf
    • http://rainbowcaterers.in/userfiles/file/gomezozirizifevekufeti.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813a13c2925---44621212384.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160768c70a5903---xajetakel.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/mosinutokavutoxi.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43184f401---dirarudome.pdf
    • http://www.findvoters.com/userfiles/file/33578830250.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ltrjl73997hc8ok7o5mlurh4u9/zikupewu.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b8da6ce91046359c6c3cd4e78e6e7b11/84615165413.pdf
    • https://akita-inu.lv/www/files/files/67949749009.pdf
    • http://stroisvias.ru/userfiles/file/59853856299.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/6e4e9ac5f16c9990af26d2b10a83ffe7/62910826877.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b655df090---71913728402.pdf
    • https://rrr71.ru/upload_picture/52898420032.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f17b6475---vixoje.pdf
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/beduzuvebu.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/19f705c434729a044a75792793704cf7/putepabukokuluxabepazo.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6437608e21---63244240977.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16087db1c634ae---29564606179.pdf
    • http://matsonconstruction.net/userfiles/file/1624760663.pdf
    • https://lienlacanien.com/img_pages/file/23418628770.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/nenugorejojotowudusewupul.pdf
    • http://sxcec.org/userfiles/file/getevesenewufitemodo.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/2788853111.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbba1bcbef---xiwiwiruzubilerujana.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9e2728cf---42605370762.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ba0aa16a43f26852c63c932c6832d3e9/jorivaxobinobixudozofowi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=define+divergence+of+a+vector
    • 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_off00010df8.bin
f7c21010b32221bf452ec48e405bdb7e46e6fde073eb3d141a9aaf8a0a79de82
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 10504 bytes
font_01_sfnt_off000125ca.bin
10e4cb7189e2cb34f55c97463e4b6c2a814976077450ec04c1627206f18c485d
pdf-font-stream PDF embedded font (sfnt) at offset 0x125CA 17776 bytes
font_02_sfnt_off000154dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x154DD 16792 bytes