Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d91bebdd1108e3…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 14:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f52334e9cfaef935fd04989c55c1fb0 SHA-1: 392d8d8d8118aafdab723bc800abd8a63d98bf92 SHA-256: a9d91bebdd1108e38bd49a4ce988d7c1cd0ee5fc11f9e976b71dfe39be1dbec1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ebgoppvdglqp9nl54ujj33krk7/33864665910.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ccd1b49b1e76ddc61082501f72d48496/67619182715.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aaa3659e6---73475182222.pdf
    • http://arohitourandtravels.com/userfiles/file/14606486142.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7ae89654---22252944298.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7aee8589442b2e60336f782ea232e57c/88027859788.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///zonigulera.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb356e78d---40684604381.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/3b97164e9c6fa9ee6dc5f6cc123658bb/zoposixa.pdf
    • https://standardpromotion.com/images/upload/userfiles/files/zadizas.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/fetaohov73d539r3mdaq15djcb/37006405456.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53de658e2d---44905630262.pdf
    • http://edwardlankin.com/clients/86087/File/koxinovimi.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609914d63579f---watituxozebop.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dhg88375bk0vedr1lp2g3fs1sn/93133812981.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4779129c75---posoletizivodagoxa.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973fe3dab40---80958374492.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783db5962dc---80230805481.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/140d21d5d35be8518826a1af71d8542f/nuvotosuviwinorimakowon.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ac18168b1543e40cc165bad43a4430d3/vipuwaf.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f64880b932---62836993849.pdf
    • http://timandlor.com/userfiles/file/16335812273.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/9bacdafc8aba37732ed8e914372d1c1e/vexirotoxivub.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=scale+in+geography+practical
    • 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_off0000ef3e.bin
eb7b72ae21fbd868713925cc3c3d13ad09274bdaba6efe109c99ad9ed123a0b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10676 bytes
font_01_sfnt_off000107ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 16792 bytes
font_02_sfnt_off00011fbd.bin
ff6e4c64447d4d0bb068373e55d1b150d963293d88b31253703b8b181db0583e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 16868 bytes

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