Malicious PDF — malware analysis report

Static analysis result for SHA-256 6339c7661e8b4449…

MALICIOUS

PDF

88.9 KB Created: 2021-08-04 09:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3adb4d39066fbc4399bceb21b6e1f628 SHA-1: 4b2b17cfd551d058c7b6d8e1f835f8dc7709b597 SHA-256: 6339c7661e8b4449f16e7d8dbf02033290b6cdf8142a743a3463860d85364aaf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the nature of the links and the PDF structure are indicative of common techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://optykglowacki.pl/obrazki/files/timugavikipi.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca31a2a73---vulasetalegafupamidu.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/67614023978.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160716eee11b74---94624554452.pdfIn PDF document text
    • https://thepainter.asia/upload/files/buponugij.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/35768553075.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/45265152728.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/kagonupafexobejubewilu.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/tedolo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc80593144---vabofixizafaxi.pdfIn PDF document text
    • https://fallsplat.se/file/saladusofutiwur.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/33f25128ad4cdb492c640ad93a63b525/simowaxojasubadow.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/79097307052.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e8c1a79d---24671752030.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/79734399176.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba08055246---fusefokolamolu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c7acd90ed2940e49752e59109045315e/wovipi.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/xuvuxajiresijegebonetina.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608317543de26---39590161446.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/55fa0076ec57208931add5bb27ed143d/mutobexuzumopufokoki.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/51852264761.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/h4ijhupa5g2plbp73vk6qjdgq4/41347756347.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/74866268221.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/xivorazinibafasexuri.pdfIn PDF document text
    • http://ymy-tea.tw/upload/files/xipukufadimejavewujonet.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/dekadusiforagopebufesixo.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/neomrc10rp5l2gnkn1hroe005q/368893575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=corel+draw+x7+free+download+full+version+with+keygen+for+windows+7PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 11272 bytes
SHA-256: 1ef680fbc56fdf43214c74322dfd1ca4525c91bbce79c92ecf8388b59aaac0e8
font_01_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 17752 bytes
SHA-256: 4ed8ae231fd9ea3116558d5f65c156a6cacb1a96ce40f08f621ee56a175cb4bc
font_02_sfnt_off00013cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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