Malicious PDF — malware analysis report

Static analysis result for SHA-256 528fef6792af4452…

MALICIOUS

PDF

84.5 KB Created: 2021-07-08 21:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: df30d8906e60cbd3b0320770efd39fe2 SHA-1: 1386573e5c6ca6427d0c26441c1e6fe5d7c7566e SHA-256: 528fef6792af445225540ddfeacaa2cd8677dcbfdffb5d14991bcd4e97c8fc50
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress sites, likely intended to host further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=linksys+router+manual+wrt54g PDF link annotation
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4c864fbc45f762b809e582e455155ea2/falela.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/de26d2d577c3bfe03b4f840605bb97ef/76133813562.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/dekara.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/genaruvorejozemekirud.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a557c274---lagoset.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a1a175cb4ca430616a74343b5f134da/92024880179.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/190131335179.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f991e83f4f27a0516f08081482e21016/98876518926.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/kevijuwiguvibotupebi.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/8156762157.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/943ec255f352a14de576598f29c71e6a/96961039410.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc2b7a8fa---tosepuke.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ad494fa9---dekuwozi.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/divururesaxobisogima.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f5fb2eabb9c7fec6769ad65d714e3b76/3688379276.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/uk08v17t0pv223g56n8urct7ll/wisefaxup.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8f9ce55c3dcf74cfd115f15939176fae/13971895449.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cdefc7cbdcd02bd3965b119fb88b382b/tarozururoxeduwawizi.pdfIn PDF document text
    • 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_off0000e7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 16708 bytes
SHA-256: 858f31ed91014b197a47e491320ababbdb5fcc575595956363ecf1cfa8c549fe
font_01_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B42 11012 bytes
SHA-256: bf75ec9c735f4f01346c16084e5d7d6dd01f90bb5c695a3a6223e1d65a2d8c19

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