Malicious PDF — malware analysis report

Static analysis result for SHA-256 de84887d74af596f…

MALICIOUS

PDF

71.8 KB Created: 2021-08-27 23:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34faf9476433c2e439de1ea39b75d9e3 SHA-1: 2e45ede103bb847e8ed9526bf8eeffb6fa5ba27e SHA-256: de84887d74af596fba61b57c445eb771a1ca5f869b55c628522753be95f3516d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, which is a common tactic for phishing or distributing further malware. The presence of numerous unknown URLs suggests an attempt to obscure the ultimate malicious destination.

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://vinacomvietnam.vn/uploads/news_file/46665814662.pdf In PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/nifisuwinaw.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c154946d7871e96643f1133d2085d626/bagemeri.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/gisubelopofogelu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160defb64a9e9a---18434523867.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe9b0e175---92841040783.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/dukon.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/98181983132.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/57665296995.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bcc0fb37e0ff58b1ac17e2d5d445e810/65038637083.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/k163i9k10oa8mfsu1eabd6p5e7/6602298475.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/zogawarutigexo.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/noxifepun.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/34871f17d1f32837e1c827ce9ecf5747/51137983152.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/kekijefokumavotevowot.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/75147696493.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081382f29bca---duboduzajejenafipiwu.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/12696899406.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/55111101820.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/napodivifeliz.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088e2ad2e5da---pekuzeromilobal.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/222ead16b10184af86836e04f00e15b1/35159815919.pdfIn PDF document text
    • http://renovator.cz/files/file/24706750602.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/sarotadunisimewobepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=oven+baked+chicken+parm+recipePDF 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_off0000bbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE4 10672 bytes
SHA-256: 1b6b04ffdb919c29631bae83cf6454572e084409febfe4967328e72bb91df991
font_01_sfnt_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 14576 bytes
SHA-256: f2b9b629ed684f5a97187d02197a7a429f9b9bdebbda12bff40aea79d3f88f3b