Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e636027fea3387…

MALICIOUS

PDF

95.4 KB Created: 2021-07-06 00:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 750d1116e73dbaf06de9ddf941b335fd SHA-1: f4a305cdc46b54ac21266887bd0cea674353484c SHA-256: 37e636027fea33871eb0e8a8f5d5d4afe348b9f9bd241805cbc45c152610de27
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and link farms points to a coordinated effort to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/55ac5f08bc9ae7b71f88130f122f56f9/jazutijuramevusozab.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/db068fed95e769eeb9b705ef1a2cedb8/30211204164.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fecfbdccf1---9749786226.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1ba1737cdeee0620bdd1431dd5eb810e/zekek.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e64b08d67---14503551170.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9fd4a2858---37478200956.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b614895e179dde05b9d77b2459db7677/kofose.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/ridabe.pdfIn PDF document text
    • http://henca.com/files/details/file/sinubatasaduzevu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/j8n0si1ajta6m75ojp5c4pbri6/vemomusoxemesu.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/14392643925.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/hsse8aum61is6b17bcdnmaq3ro/vosajeje.pdfIn PDF document text
    • http://medrea.ru/upload/files/76322682005.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b748bd8cad---9595567963.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/50ba3d6d9a6f5f3fbf181b30876673d9/76373698398.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/40c98a8711218b7020ab84865dd09bc9/xebazojutaxotoxabinexo.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/gupasemuk.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/nirefasetetogejixej.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071693716283---65942651626.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff4dcfb1c---29920591100.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/43345480310.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab830630b7---naxedi.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/80258385209.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/kogavuwikedipal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+equivalent+capacitance+of+two+capacitors+in+series+isPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/79469391027.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 10940 bytes
SHA-256: 19e8a09b7156378a30cbca613c32f84e4831a8c7b5f9f957215ce0ba7124f32c
font_02_sfnt_off000142b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B1 17132 bytes
SHA-256: 332f4d20f1a4d18537836434509273405ed0c3ce3ecf82fb54f28868e076426d

Open this report in the interactive analyzer, or submit your own file for analysis.