Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c7f349ee43775f…

MALICIOUS

PDF

83.3 KB Created: 2021-08-19 15:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 52ea4a15b4f05320ea8771a43431a875 SHA-1: 8926bf184f134353e0c44249355d6663f66d3f42 SHA-256: 88c7f349ee43775f9110e08d42364df3eeb4d5dc421c8abcc9e56b75715a8fef
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL distribution suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe23cc0d2ae---54363505008.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ad58bdde5bd886d90637e273af340e5c/74483794621.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/53919138830.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/86689832030.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/15182849053.pdfIn PDF document text
    • https://kaisar168.com/contents//files/18107733995.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/20508380172.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/39d88d805cc3111eb0584e181dfa34e7/33904601875.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ruamrp0hnfalvrlch3jgbasq8j/juperopipipigowimaxa.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcf17213b---2783582192.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/58956f4790edeaba6c87e0bdeeda4974/kerolorelavipa.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079c50878520---potekixisigiwukuzop.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/pilokepofodusudurakututa.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c278acff1---60169169845.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b05426a523b---72751593806.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/00b0623d7731e3f9fa04e53764f9f438/7590985363.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/lopobopagofozukidulap.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/84811479768.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/kemitevonox.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/dokimalevibuloxaxiburibej.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da3943b7aae---gexuvewasozuxetonakako.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/m5jmln3nb542sf7ei2hft2up7m/6050286095.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbf5f4ace9---18347790313.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/lotosasijudigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=can+you+download+pictures+from+instagram+iphonePDF link annotation
    • 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_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 16132 bytes
SHA-256: af49ad4ab6f86913a3d6c8d7eb1b9d63d2af26c45c5456460565a524082cdd32
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 11400 bytes
SHA-256: 052e4743a533e44abbc81015c33540f51540777c6eb134f0652278f7497c9e30