Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07c73fa8f10968d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 12:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c2354a944d045b22921f03902b0fbcd1 SHA-1: a717cd91641ee9602ee85eb30a61296524fd6b03 SHA-256: c07c73fa8f10968d9b4839fa2ef1204bb4e218a0ef103dde3878460975d34e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm designed to lure users to malicious sites. ML classifiers and ClamAV strongly flag this PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of multiple external URIs and link farm heuristics supports the classification as a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://nieruchomosci-swidnica.pl/userfiles/file/33505359960.pdf In PDF document text
    • https://hanyauntuktesting.com/contents/files/bebezesabutenikifasel.pdfIn PDF document text
    • http://masonhn.com/d/files/derusuwumofaposabe.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/51423951262.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138dbc09185c---vapoxaliliwofavodomaf.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/15164786440.pdfIn PDF document text
    • https://euchebnici.com/img/file/dotumimesopasi.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/biziberidipovibitejudo.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vutojenobejovuboroz.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/kenozisivobeju.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/72200007994.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/mabitabijumamafora.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9adbaf1c557b4a58b6af4e920fc3becd/39714463985.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/61814292325.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/wuworukuwepomefi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f03c0548ca79e102fd51a3ee96b79213/81502998451.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/46341114620.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/95l7fdve5afp9fb4k8a5f462ar/duwifinezigobide.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/fosoloromamonufadodopaz.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/8065183571.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/79158511597.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/79416372715.pdfIn PDF document text
    • http://isgsrl.it/images/file/pavaxuwunidumed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=miya+bhai+song+download+mp4PDF 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_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 19516 bytes
SHA-256: 0900bb1f08c10206f4b5790040fdcd02c693185aca4d084c3b506661184a3e75
font_02_sfnt_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 10920 bytes
SHA-256: 5f034f3510eb99193bc979c7b763204e7dad72e7a816fc5929a7567a1127f98e