Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1605c4a9121683…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 20:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdedc585cd80e74403668dac99e8268d SHA-1: 653c3b3a8487ce66d91c84f5609915a669ee3715 SHA-256: 5e1605c4a9121683d339411e37c66414e35ad8b3ad9fc2e97f93b614f022fab6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves a malicious purpose. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, some of which host further PDF files. This suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://0955205219.jwa.tw/userfiles/files/babimoluxefirateluva.pdf In PDF document text
    • http://fongyoskert.hu/userfiles/files/22259464720.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/ranotafusigadut.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/82180449974.pdfIn PDF document text
    • http://prompol.com/media/file/7156554533.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16132903c9f3ac---nidederanogexegagi.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/48810140579.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161384617b7e22---detogaxupujipeganada.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/20630068341.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/zewenitexuwup.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7425edc06---zogugopogeg.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/livilojamujigi.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/76747375807.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb49e8bd8---jejidajixemokexo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614192c2c0f85---wimejosevowomifavekaril.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/7919294808.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/90054649912.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/75479465116.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/61845629255.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/95082783122.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/fotur.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/mijelikikateserote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=big+bash+live+streaming+online+freePDF 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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 17476 bytes
SHA-256: 48c9f3a331a70d7e9152b97904c3c67326d364bd75a9bad07255708bc93a8bc9
font_01_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 10920 bytes
SHA-256: fcce4238cd815c1af70812e0e6ae2d6e9fa814a627edd569889a27d9955cd35a