Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efe7583b3c973de…

MALICIOUS

PDF

88.7 KB Created: 2021-07-05 15:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 358e232ca4c2d453c97350e1ea85d5a6 SHA-1: a11e511b80ebe95c0cd5cf833da39fee928ced70 SHA-256: 3efe7583b3c973ded914edf93d121304b3e423519431f9c95ff101b4e8bcb416
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution lure. No scripts were extracted, but the presence of a link farm is a common tactic for delivering second-stage payloads or directing users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://medvor.ru/uplcv?utm_term=how+to+add+link+to+illustrator PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a7ac400c3---34867107804.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/70588492134.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/bodevutogamed.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/7220051481.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f6f9432a036492659e3fe21fddfcaf40/2562842028.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/dojitufezosikafokebutexi.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/2753918535.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd805f3e8cf---kagiperumotorax.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607018ceb9e14---zobezajotifokivedowafixez.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a481d75cac6---91474175343.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/i0rp7ur7pp9um620o3tue3g966/lexod.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/78295062098.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/buwog.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/movigovezixusoweri.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ef5a6073---vapivu.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/7239865613.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160929ac253e28---32844173063.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/godaxugu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ude34d0cre92sccl51e98teguj/bikez.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/gibijevadorozejo.pdfIn PDF document text
    • https://aneri12.eu/res/file/zaxupav.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/br4d2qrc92v3litif8i7sb3h93/1558794500.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/nowobukin.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb935b35bb---vokizewuvinubasul.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ej0s9inc85p18cb1h5m0as85mu/soberijafumuxel.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098849916673---54560088312.pdfIn PDF document text
    • 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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 17600 bytes
SHA-256: 5decd08a39dbec67479e506c7ddc2f681266a56d11515b110af0402370f50b7e
font_02_sfnt_off00013da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA7 10376 bytes
SHA-256: d6232c5f23c184416fdfcd9401dc6b531aa692b4f4062e03252ff32e5a601012