Malicious PDF — malware analysis report

Static analysis result for SHA-256 81582b10cb295004…

MALICIOUS

PDF

91.0 KB Created: 2021-08-13 03:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 941173fb11a4ed91f741db6a368d8668 SHA-1: b76ca03404de0e329d32d318813dbfcab12600f6 SHA-256: 81582b10cb29500492f35e02b1baa8ef46d07160d75ccc3b683cc6adc50a2705
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, indicates a phishing or malware distribution attempt. No scripts were extracted, but the structure and heuristics strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dewalt-naradi.cz/media/upload/editor/file/loruxagosikufovikajiva.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608adb32a532f---84888211306.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b13fb695f2---tipizamepodolibetetov.pdfIn PDF document text
    • http://mamam.by/upload/File/file/29857327692.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/padulotimidavuvukabug.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/fosorubagemojeris.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/womezonadesovisujelozolof.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609867e76b3e6---pijaxu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d1f423c4451b411828f283a2a5e57b62/robipaj.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc7932d1aa---gutifibosutojutiripidebev.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a55af1cfd23---jixeripalulotejodimabuvu.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/vevevelifakapiwogedepus.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/80819380202.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/lusunu.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/95083596690.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a799c1af80---malawut.pdfIn PDF document text
    • https://bachson.net/upload/file/zezufag.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/83147390986.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbc6a0ca38---noxupuwalimatuvik.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e16564878---36660506389.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609066a6ad8e5---21436256753.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/370544131.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/aobp0nnmvpakpq622gh53718d1/rabisazopugekelimenopeva.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/xokunimajuparitamonip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=where+to+buy+parts+for+lg+washing+machinePDF 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_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 17300 bytes
SHA-256: 7a3bc7afbf841c263547375e3feb834dc2ba9bddc4a6cbbeac917f620d99fc36
font_01_sfnt_off00012ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE6 11360 bytes
SHA-256: 24dac03f61e9f041ab3c2aa81915f1aa74f51dc4a38ed6fcb4b79f6af7556990
font_02_sfnt_off00014561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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