Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf41364bb014ce1a…

MALICIOUS

PDF

89.4 KB Created: 2021-07-23 04:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f55d725392eaf1b560830c08003c15b7 SHA-1: eada94e1e57a257d6f95c5519f72f4e4e5a00ce8 SHA-256: cf41364bb014ce1a4816891c40c132a6ff52d87ee3205eab7d8e8977b8030eeb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URI heuristics and link farm indicators further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://telekommarketing.com/firme_data/files/34465034847.pdf In PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/2faa51aa8233d36169424cd500f56273/vutiwaxozabo.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/ninuvobakupolunaf.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/10994019751.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/69655012904.pdfIn PDF document text
    • http://axwelindia.com/uploads/noxojixegeguxaxedavoz.pdfIn PDF document text
    • http://majubesar.info/contents//files/68044669579.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/kifopimoguzaw.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609c78716c2cf---lefasamipadasokigizak.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021060400322451.pdfIn PDF document text
    • https://posh.hr/files/migaxakuki.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/43800458598.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0es9vc30mmnfvtft222822s7ba/baferoxajugomun.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/66ce354607024fc464f61d08b9f75b5d/fibejizikuwubinirub.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/10415860118.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/cdueen6uks4k5geeov5nc1qgnt/84253877090.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/32656852630.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/22749379331.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/nukamibujel.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fbd4834f1---domilorevupesarujazitil.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6eb46c9c---79720651863.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/95633833378.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/bugorelo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2a7c4e5f543bac99816cbe67856140ba/16703857502.pdfIn PDF document text
    • http://sbairs.com/datas/files/23173071768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+difference+maker+pdfPDF 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_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 17336 bytes
SHA-256: 9db0366b006859759df7531fa41b1e2b0d0c9fe36f965d6662fdc1f8ad90b41a
font_01_sfnt_off00012766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7D 10508 bytes
SHA-256: ab0f3f8600a4842be5c4bdcf08547f4679f57a606eb60a18fc60b4ab98f21afc

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