Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc7bf3d768fd9d7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 23:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ae26feb4102e67478b93e47983f5fb1 SHA-1: 2068912c5ec6bc384ed7aa7009a7fc66ef6bd9ff SHA-256: ebc7bf3d768fd9d78b3c611b8293d1d6eb7d86fd718956972c77d1044073bc09
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. This suggests a tactic to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160872825ef67b---97789504853.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210615025911.pdf
    • https://chief-moving.com/editor_upload/file/83306632756.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ab11b4b6---kaxoxonakemo.pdf
    • https://kmkmekanik.com/upload/ckfinder/files/mulozut.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160728ed86922f---55864158789.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/e3vf6sis1pfhjp10876qtvps9n/54158832371.pdf
    • http://bannermaul.com/userData/board/file/36517167503.pdf
    • https://magyar-logyogyasz.hu/fileok/file/45116104952.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ebc753306---39645887820.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/9b8c58143e9f38e3cfb471e0d2144e5b/xapejosamafonupuz.pdf
    • http://garderoba.sk/images/_file/daxuwozosutabetavuxufevu.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/kulajaruvan.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3of1h6rmhg7d3nu1ua4jrkhash/49884481418.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/nonarepiverugima.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210822_4C022E178D5D8FFD.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6327cf3141---gafakajawubebokosife.pdf
    • http://lanaecoloridabruzzo.it/userfiles/file/93261742474.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b863144468dd1cedf8c1ce18e21cac54/56920087719.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/48143925575.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b2bcc443---14577226805.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb7dd3e1a---moxebilekutezubule.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/mtcug6ddnjn6af9h9tcm3ho1g9/29370815445.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fa42d8282---loronibaki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cbse+class+4+english+book+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_off0000bb09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB09 16792 bytes
font_01_sfnt_off0000d31b.bin
d3b7552d13d5f81ed8d9861678cd825a6544d4a694cd02bcb601351390e18d1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 16728 bytes
font_02_sfnt_off0000fe2b.bin
b3876c7f24435aec9e398104b22ae2e89ebf6e252dba198e7d64b2c06f79568b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 11040 bytes