Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f370684addb8b55…

MALICIOUS

PDF

114.6 KB Created: 2021-06-30 18:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b37293ce238cf8368fca6d3f6dbb49f SHA-1: 8af41665f69b4a3ee5d594f4ec5501ecb4b20997 SHA-256: 7f370684addb8b55af22d4713d7784ed1cf8b1497a95cd9d2a5016b41c35df45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are identified as compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests it's designed to lure users to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5c4be5932---54460185144.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95281dd287---59072020563.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7610c1b33---fewabida.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2hj8dsc0ih84f7gb0ip08om0gc/pesekobisupak.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9cb6b4cbe0e96fb0468941bc7dca8359/38652609612.pdf
    • http://janandpoos.com/clients/872640/File/fokuloxusawaxizaluxe.pdf
    • http://chixue.com/uploadfile/file/20210626052301.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1hcvendc5fdth77mpfbjguu3mp/nariviga.pdf
    • http://www.aportecnica.com/imagenes/editor/file/lekudu.pdf
    • http://iphysiology.ru/upload/lideboxumezobujijogefama.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7922243a---45510602931.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/lsmn5utea8u98jbdk77c71023l/37666993330.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hf23lqlop9uprl6lp3gldgapl6/majorexikokobifaxif.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b32c5a266---lotoxikowotavipi.pdf
    • http://atenngo.com/admin/sites/site/documents/somajukine.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/df25b960d0c1b74abfdc68f07d0f6c8d/16637878817.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0a2ec048---28524091394.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b5d10a858---94805869537.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+places+to+backpack+in+oregon
    • 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_off00015dd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD5 16792 bytes
font_01_sfnt_off000175ec.bin
2863055133ddc0b720d4126b74a87c0b7810c91c89586bb622b792f78664196b
pdf-font-stream PDF embedded font (sfnt) at offset 0x175EC 10832 bytes
font_02_sfnt_off00018ee1.bin
2cd42e4d8d5842ac7f8b370882ec4d5718e301b170f92fd88e838d6ecf842067
pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE1 17704 bytes