Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cf35493c2a21c4…

MALICIOUS

PDF

128.1 KB Created: 2021-08-02 14:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f133ca19065ed576e95fc19c78b2d08 SHA-1: 8c85158541b0ba110cb592cf0d51c6846774029e SHA-256: f8cf35493c2a21c4747fe5b4f16e2be0c20317b4d077b3255bfb1089ac8816d8
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites, likely to distribute further malware or phishing content. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbd5c5e920002c8fca79d61b78024363/gevatebas.pdf In PDF document text
    • https://aviseco.ro/userfiles/file/22573054362.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0957bc3309b1b7159cb1c04e14bf2e3d/76366288580.pdfIn PDF document text
    • http://cochu.net/resimler/files/33768018456.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3e6efce3889f32aac2ff56040642e157/34668184554.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0abc24b5---zifom.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c6f596d72---xofusefopevu.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/zatoxonuzom.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tctme9badefa0o1lejo0gm62n1/73645140975.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/gisalegirufus.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/32e33262864962653708d1d765874bde/rerajitoner.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7ec39b95561607f97594ba214ac75f3b/59810469680.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fef0f15dfb---lesuwep.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b0c2e3b85b4243ee99399a3707ea0595/85319423837.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0ec8572880773536c49186d91d0d30f7/10835236991.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/23414623159.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/tipobujude.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/vavipidujadesobemerum.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/ranawirikawage.pdfIn PDF document text
    • http://www.moyekolodin.com/files/46916539516.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54fef61003---zojugokasalijadoseme.pdfIn PDF document text
    • https://clubon.top/uploads/files/55747606881.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/xejudikarifemibifet.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/75921645621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=2014+subaru+forester+manual+transmission+for+salePDF 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_off00017546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17546 10888 bytes
SHA-256: 7f3b8fcd502b9418d4c4d9b03f9701183db5e65c031b6bacb87b228b9664277b
font_01_sfnt_off00018e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E87 19196 bytes
SHA-256: 75e43502ac1222346da40dbcca2536603ac58acfac39cd117239785617b3b0c9
font_02_sfnt_off0001c13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C13F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D94C 6052 bytes
SHA-256: 6e77255d27aecd38b6842d3fc97c6b45fb2b57c9035f5a0a5561ffa95e1f67fe

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