Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c069d113dff35e2…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 08:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c23e02e75ebb616c0ddd49fcda762a9e SHA-1: af520c684ba0d39a33f8039e60d767a1f5bc4d07 SHA-256: 7c069d113dff35e295e18a74ff116c62a9749cbc0b875cc372c16ed6da255f4e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and the use of UTM parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba1cc4bf4---28242251842.pdf In PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/a377084738c6c214ebe8c7688733f456/gomiwejug.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/080b66dc56cf82f05f1f4a5683cfa209/33012215357.pdfIn PDF document text
    • https://peterdegendt.be/file/revumetadamatorul.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b77f2179dc64032e072d79c4c2099709/wuridigi.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/2vhukenifsngqu8ksdv8b2tvi4/naxurovidat.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffd4a3d6a---12862462910.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4c45af4ce---lasojolobapegugume.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/wakeguwafinaf.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/fitetoxarawokolakavomeke.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/zufakupelusezajofe.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210511151257.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/78125591957.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aa19b5fe5---16131077478.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9e4726b620ada14158040cff469ec8e1/54387720555.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/18410419216.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/xafutomipiwuliduzumu.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/11408699698.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/5649868829.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5172c1f3b---21751845927.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/23652b178e108ef58f5a70ab220696fb/16866919972.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mi0r6v4trlqutl9sro4g3p6rbm/besin.pdfIn PDF document text
    • https://airshow-bg.com/file/zinufowaxenixodiku.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/86646011769.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c281267fe528f4fc7df00510363e83d1/lezebixinujep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=delete+pdf+pages+on+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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 10680 bytes
SHA-256: 7428ae026791bc38ad2f74cb37f454e44e636b2aa731effc880ace5790af2901
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 17248 bytes
SHA-256: 4771537550f7d25e58f2a6647ba0fd0775ac5127b30401623923137186ddf6fe
font_02_sfnt_off00012ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1