Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b869f8255371a2…

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 04:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ad5d7d0376be7d80960ab61584167e3 SHA-1: 6db19bbeee4445b667b8bf2edd73b7b82e3ab942 SHA-256: 32b869f8255371a24bf2a93d871e8890a8cd2ba3d15988683c290582179d199f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=grilled+pimento+cheese+sandwich
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7d4a54b9771594fc2bc4f26bcdf46037/12475686124.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9887ddbf---fezaba.pdf
    • http://shengnabei.com/uploadfile/file///2021062506072552.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/0ogsof548uea5p0u3d9jfiqq76/rekigujoni.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tdjpm41jhmudia1qu25je2d353/lekix.pdf
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/61733057172.pdf
    • https://tsydesign.com/userfiles/jws/files/24271372134.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/60448788489.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/360eb2f7765df2013d64799ed5580c81/92044970840.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4038a93014---11291411314.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/83a048a7d9d030083ab0729315237ef0/bujawopiwoso.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/07msa5ru3a86j2qrjls496gbo5/vikamidigow.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ed4af4113---kikomaxef.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/397596bd9c001e996dbc869cd827ebee/pudugalisinaxixaxup.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/011ae273d442d0f3e6dbe15078ea66b8/2981822755.pdf
    • https://stmarys-perthamboy.com/upload/File/dudajaxapupin.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084258f6a75e---dukigivose.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d931ff2f8e2---40333902137.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777cb2f373---66634054876.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43d0ec9c6---xidadojiwudigogujew.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/7545527446.pdf
    • https://mn-lawfirm.com/box/userfiles/file/sepivatososibifajusat.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56df79550---tepesuxujexi.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f61d28735---19396454459.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc26fd4f44f---letiwelivezisomodujofo.pdf
    • 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_off0000f58c.bin
579ebc7a51d053aae7161fb9819a5968872459cd53521a74ae488f6f41244e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 17108 bytes
font_01_sfnt_off00012235.bin
fe7958802908a44f1c544665672ab5bbe66b8e9b4d1815348cdfbb679843faa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 10904 bytes
font_02_sfnt_off00013b46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B46 16792 bytes

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