Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1ed87f3a1cb33f…

MALICIOUS

PDF

88.9 KB Created: 2021-06-28 21:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03bd00ca96a777a26787e9627b1f7015 SHA-1: 7547be8efc124082928df444c142ba36bbe9875d SHA-256: 9e1ed87f3a1cb33f62079fdae303141ad4c296e1faa156c6f058ec5b7c84986d
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The PDF is likely intended as a lure, potentially for phishing or to deliver further malware, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/pf2v4rn4kj76lchurku7t34jhj/90826799958.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96fa0dde3---32109353259.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/budetafed.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/66b1ff08961e9f75e5aeb7399c0b27de/pevunavejibisafoleruj.pdf
    • http://tgtech-auto.com/userfiles/file/nekirapun.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ade585cf9dc---22607924151.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8q6ekarmtajvnn1lnht79rddd4/98889243965.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b73e467c34b---36639011962.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8rliu7u5bl53jnotekiehhb1hd/34092699051.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3cf6f9a943782234147e55ed613919df/sofasutefagewavuw.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f498c050---72961237041.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7cb4808920bf69a03089752931dcaf04/musatugukebu.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5445b9ea6f1f4fd71d32e771255f439e/32932980850.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9d3278ddc9fd4dc56dc82003cae34ff5/goxusemaxebovu.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e4fb724ade203055c8362c61f1bb9745/10296961812.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gapti4uhh5cbg4nscuikbgfg0l/kiwonojajixuwabinizijan.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d3782de6d9583fecc537141e65b66d1a/buroz.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607070919e586---fisef.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5406bcf091cb65dc39e384c82c37c51b/nufulazan.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609df42ee56e7---famiwaxedulapozevig.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a27e16b6e---96237882889.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a780ed6c---67474678291.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=red+tail+wrasse
    • 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_off0000fa39.bin
a357150423b977733f7e6456b233fa98abf3c1d138d0b4c9184684b691d6ff2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 17416 bytes
font_01_sfnt_off000127df.bin
5ef05b39d1f3d754ae178898f004ead31e52c41b67cba204f8d2b6748dc1848d
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 10148 bytes
font_02_sfnt_off00013ebe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBE 16792 bytes