Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fc26f1f984c850…

MALICIOUS

PDF

76.8 KB Created: 2021-10-15 18:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a58a430b25c914d5e5a8e04132c374a3 SHA-1: 17001b93c3adafbe960c8781debc39240be2cf5a SHA-256: 87fc26f1f984c850a7e54fa629230583f10599ada6b8f4b4d42e0163a17c7949
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chcial.ru/uplcv?utm_term=land+for+sale+in+kendal+manchester+jamaica PDF link annotation
    • https://jin-hung.com/userfiles/file/vupipexoga.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/somatoke.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/18267043393.pdfIn PDF document text
    • http://tzsunup.com/upload/42886341583.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/dopowusuvorogenerefovuxiz.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/fifotesabazetidaromuxa.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/vaxodojebuwulujoduwideda.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/36223599382.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/8034977396.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/wavubonopuwiwanumoxago.pdfIn PDF document text
    • http://cwsf2013.sfiab.com/data/userfiles/file/femagi.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///lajokutututuwedumev.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2cj9mq4g9auvt3ptdrlsmlnf64/jakodalapejonat.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/23354954638.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/nitewolomexikukelu.pdfIn PDF document text
    • https://qkon.ca/images/file/12085509625.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/lenedokogekedi.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/72119286888.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137486e152b1---kanejoxawiwenupuxufiborab.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/natevaratuzapalukixe.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/sujudufolupomotutogemax.pdfIn PDF document text
    • http://fpole.ru/sadm_files/jetuwexusadobivefiza.pdfIn PDF document text
    • http://npas.ru/pic/file/barijepop.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149afd98c2cb---pasixisonabopokivodotarig.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/ripiz.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/nuwukivimiwefigoxo.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_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 10920 bytes
SHA-256: c21b07c67c704ed33b49b4e78f11c005e5a5005d56e6782452980a4e536f35aa
font_01_sfnt_off0000e1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 16800 bytes
SHA-256: 1a4eecd7c5129cf36bc4dd836bda1fe9043b4ad5da3af73e17518ff7a4d18dec
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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