Malicious PDF — malware analysis report

Static analysis result for SHA-256 995c925758854262…

MALICIOUS

PDF

76.8 KB Created: 2021-07-02 13:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc0e65e59966949f9a437668292cddd0 SHA-1: f370116beebe5747ce9f42e25de4cd4526dc83f2 SHA-256: 995c925758854262b7cf6dff892ea9fd82d6c780004d904e72ea355310311dc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608710452aa5a---mofebapiwesateguv.pdf
    • http://wittlich-luexem.de/userfiles/file/nelojumovagixasofejaj.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b33387bd09ad56921c28f144b667477b/satowifefuxufudinoxewokum.pdf
    • http://sbkf.org/files/files/37048743274.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ba944e00f---lewivibageg.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6fa075339c71ac36a932baffe3b83924/39952164469.pdf
    • https://ludifrance.fr/userfiles/file/wiwovak.pdf
    • http://pallenberg-busreisen.de/uploads/files/leguvagepumetemonosudates.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/76d269993545699459e55fc3382781e0/90200730910.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fee8736c0---lexus.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607665c7cdce7---26945750007.pdf
    • http://stillwaterponies83.com/clients/74660/File/jidunukedebupoweroza.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/731ae090e4b7ce105dcf3c64945eba0e/42717696342.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6a8785f6---lifujumavatinewegixepiwib.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-23/20210523220126105297.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890ba6d9746---56794256978.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160962541d15e8---2062325697.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a50524318c0---nakufiti.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/jizefojizubunuwajuvav.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/21970845261.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/wezisil.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ac5ba0d8c0d9ed52799b6921a97a6838/vixivutixapi.pdf
    • http://alkanboya.com/files/file///lufoxupowufukilogidiz.pdf
    • http://www.kickcommerce.com/userfiles/file/xamepenogivutopokorilu.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee319b346---wejonotetanufijojesalaba.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=half+the+perimeter+of+a+rectangular+garden+whose+length+is+4+m+more
    • 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_off0000c5fa.bin
680f1c9c672a6316c0d8e9f958da538d0007ae2c20b2d0bad3f742ee9b5b3c4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FA 17164 bytes
font_01_sfnt_off0000f2d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 16792 bytes
font_02_sfnt_off00010ae8.bin
b78e5582fd6351fc5a15b3593bfc22b38f982e38d1de155d753a34c851e6b11e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 11324 bytes