Malicious PDF — malware analysis report

Static analysis result for SHA-256 7997f28f3def69ab…

MALICIOUS

PDF

90.1 KB Created: 2021-07-18 08:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9bce439b64aabc450829bea8aa0da551 SHA-1: 8810208079e67f652ba3a2f32c735f589d1ddc32 SHA-256: 7997f28f3def69abfa2319f5c29cd3eca45ddf3974f836bf18d1f23d90494f66
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ogkoqru9bk0pjdiv1d73hmqqan/tubopasikixenuw.pdf In PDF document text
    • https://alianzatours.com/imagenes/file/xisovol.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/ca738a0e18d6a1fff0b730eada0a0857/78071097471.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2b3e1404---9581295057.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/namabodi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fbot9jfrm7pa0ksqjvif1b1lf0/paribaravomikoxarasuk.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8e6326447---kafizovudakukazu.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/9899572117.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/ludoxozezorojutibimu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6aptvdjunt77s60su27hu4gai0/94563948839.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0c19984e---82326965778.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/vedatusenojukirex.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc13d0c7b---92943999858.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e383d3c9cdd---2914813612.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/k96ektbpsqlsi4a08dvp8hgqoi/mevonilogufugofejuroj.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b5073b4eb---rodofelovudekuto.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/ralemakizaserebimobobut.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e52563817a9---80791049191.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/806ca402751cbc4dc7f4cea012faece0/lozajabitexobe.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3d6e6a3e---15326968031.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ae8c7f6e47a74dfc09240469de678d2e/17904978854.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/nivunedilanezew.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e25313e394---67143387454.pdfIn PDF document text
    • http://soles2walk.cz/data/file/69456434491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=robux+card+code+generatorPDF 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_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 10624 bytes
SHA-256: 506a54ad32e0f2aa09de1c808ade89b87b1c7b2a014fed6a1fa4faf8dca1f7d1
font_01_sfnt_off00011458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11458 17824 bytes
SHA-256: c74bdf1f0d7bcf7322baa8576a9ea06103f539444a1e97cdfcabf31065fc949c
font_02_sfnt_off00014302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1