Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1eac24c2429a37…

MALICIOUS

PDF

123.9 KB Created: 2021-07-04 20:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5c3e4ec0dd635e2ab168a540bf155be3 SHA-1: c97ecb0f403914b1fa73454374ea21ed1ee3b453 SHA-256: ef1eac24c2429a37dda81e6fabcc6021df49becf90ce8104769f0cbefc9c86a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b1578deb---41063204338.pdf In PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/4347bea4d868f9589210ac4a2fcbb664/zajefosasorovobupubexex.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69b5a75d0---fowopoxunemibifef.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d97e5f9b9---mozetiwizo.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/65582567440.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/84403067984.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609436c2e2c16---99568925393.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cc5ef93b2062938929dfa50ecb0bec98/fosavetazudomalowimutopaw.pdfIn PDF document text
    • http://nensi.si/upload/file/54273016331.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/mokufodugefexuju.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/66613826963.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/41b8d04496864e6a018e3471532e9f9a/jisupawuwiza.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f64e17768---materuvevijavugaxiz.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ca546fe9453abbc4ee5cd111536146e6/6450583543.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609da63e9424a---tezuj.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e9e475151---pafiwamozenakosareral.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cc7ec5102---pitexukokode.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bd2c21638---magelorapo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f3a3a2f9---ponulifonamububi.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/nurewopa.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/a0ivacvp7pg5ceq4bs0s8elrg0/vivixifosaxowurorapokigim.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d046a14b1---86407108215.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160720e6778f6f---51859107646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ff7+dig+site+mapPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CA6 18448 bytes
SHA-256: 3426bf4c0017c881521c18e7941b80c4e9e1142265da725b0c17b9be68624126
font_02_sfnt_off0001bd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD33 10500 bytes
SHA-256: f04730feebe9738286e46f7fc44f3dfc5aa0a2835777fc7c3ec1add16145ad31
font_03_sfnt_off0001d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4E8 3176 bytes
SHA-256: 05d5c003434d0fa862977f1e1f0d9fa4c06f3950d2043396c4ffcd9021c6ddf2

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