Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e411630cb05ca46…

MALICIOUS

PDF

77.2 KB Created: 2021-09-20 18:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 042541c75f9021df541dde53bcb50de8 SHA-1: 771b28b83271e449f08e4904782c979cf84009bc SHA-256: 0e411630cb05ca46287797be315fc33f0a7a5496f278081f3e20a99b0adb0fe6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress upload storage. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm attempts to obscure the final destination. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings suggests an attempt to distribute malicious content through a network of seemingly unrelated websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mostex.sk/files/articles/file/jowezanesenozi.pdf In PDF document text
    • http://stmrcstvm.com/userfiles/file/19583227311.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/zomejabatiset.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/12107659800.pdfIn PDF document text
    • http://khocabien.com/uploads/files/dizefazubolimigeta.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7dc4a98e6b8be775d17f93f1e5b72ce5/7861493364.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/fibidabekup.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/60823318937.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/xomavefovopiwafevuluxer.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/44313625836.pdfIn PDF document text
    • http://bushurov.ru/images/files/pokerowopevatasafasumotil.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/52376763163.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/295479660.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/selejodinejadikafimad.pdfIn PDF document text
    • https://riwg.in/userfiles/file/tidasitekewad.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/zegase.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/38686845486.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/150801dcce2cb098797d184b463760ed/fedisafuweliniverami.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/e7c07826af46511bc863f80d387098ad.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/47736e22604022e62db212fca019319f/lakapogodotabo.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/86178420305.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/ditibabuguzotido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=today+full+episode+of+shaktiPDF 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_off0000ca20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA20 17296 bytes
SHA-256: 657fbde47bd8ecf3eccc2de474d77b360f400e4cdfc49983a0cde8ceed517f09
font_01_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 10660 bytes
SHA-256: 0c925cea0f6590c1508738112d073799d3b8e9c6ceed232e265bb1d7c9151f46
font_02_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1