Malicious PDF — malware analysis report

Static analysis result for SHA-256 f359e7ae538ffec2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 06:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0af92540e86bc797de9ca14ae3255149 SHA-1: f75b724b1b3eb68c08b36e6935a4b4649de8354c SHA-256: f359e7ae538ffec240769e7b2c6478b6cfb811491150cfa96083c420718409c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143990e6b0a0---2030977611.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/15844042170.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/putalisog.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/83173600440.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5081864a98c237d8b05ef4e8b590eb64/ripojizuxu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421e3bc1c67---kepowegivimo.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/molokaxojidenufetit.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba4f9e9a1---60609297487.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090914285170554.pdfIn PDF document text
    • https://nyig.com/files/file/detox.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210901210749.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202199612374833.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/fuzodusinopomos.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/wimituxubebuzijawivov.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/23167600094.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/tubodaxafufeke.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/i3d5eteac3pnfp32jmmtqg3j2s/gatumezarez.pdfIn PDF document text
    • http://kme-kme.cz/files/file/85616535096.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/vubujuw.pdfIn PDF document text
    • https://hoavily.com/uploads/files/pololamopakovar.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/49260937383.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/90683683614.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5c1aea670016dbd48b5fa4d670b40b51/nilebu.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/82044560868.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/tepitovopoz.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/21365223776.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/80250690219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+android+music+player+offlinePDF 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_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 11048 bytes
SHA-256: 40e9c116a8b7e25c81a6f3e81120ed8cd150035566179ef20a11ba866687502f
font_01_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 16776 bytes
SHA-256: ef1cf9c2c4dfc0908b0851baa4a1b174f744f3838f7ac058de2be59aee46137d
font_02_sfnt_off00012463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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