Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1df1c931660515b…

MALICIOUS

PDF

94.5 KB Created: 2021-07-24 20:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d312c5202342e7a98eab50a4717635d3 SHA-1: 9d3d84e71e0f124a61ec1e966be0221e3020def5 SHA-256: d1df1c931660515b56027679c275aeb96bec8c1feda6beda54f8f09df3124cc3
156 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while numerous, do not appear to be directly executable within the PDF itself, but rather serve as redirects to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d3bf97747---mazopekewebefelalosureser.pdf In PDF document text
    • http://energo-market.ru/sadm_files/menupuruvonene.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3062099c9e35343db33e2f0b24336307/fepow.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/27449621457.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/3228890586.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af5e452dd294b381a2d82a8b4bc9f8d0/tobawuj.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/15670360994.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/41129691181.pdfIn PDF document text
    • http://bliksis.ru/userfiles/file/23851022709.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/6e6852c2fe0dc3fd31612b60c3a5dea3/60390666875.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d6b6e9409---maligefejosumimus.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/vunijefavenuki.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5777338c0---vonukadu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4751da81---13409275943.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/27137774661.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/261a3c3da64d24ca57f1482c80debe59/59776126759.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c998bad3e---gowagarogazan.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2bade995747e46ecc9c18b0508a3a8fb/melot.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f9935cb5d---40139296653.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0627c9ea75---46467661049.pdfIn PDF document text
    • http://teplospectr.ru/images/files/sivobaxefanupudigitejara.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e4b6538c6e352ba7924515d189d194be/vuwusoxeponoxevaxe.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a6d18822d---44967828111.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/47530285405.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6223fda46a3a0b719f72b3b939faf250/revinokejudaxokosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B8%D0%B3%D1%80%D1%83+car+the+videogame+%D1%87%D0%B5%D1%80%D0%B5%D0%B7+%D1%8F%D0%BD%D0%B4%D0%B5%D0%BA%D1%81+%D0%B4%D0%B8%D1%81%D0%BAPDF 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_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 24940 bytes
SHA-256: a0dcd1f49b847f893f3745b0b5d4ac99d94d1c916e0598322de7c7fd9f083ea2
font_01_sfnt_off00013476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13476 12244 bytes
SHA-256: 462db24af89b8a3f04d2281a6ee23ca412d714e7f0cdb3e17f0330807338e7cd
font_02_sfnt_off000150c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1