Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96b3385fce14e1a…

MALICIOUS

PDF

77.3 KB Created: 2021-08-09 01:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 38ca860d78132faba2c6bc4b864d9185 SHA-1: 50ab09dad64fe756d302351f2ac8ea28d2fa938b SHA-256: a96b3385fce14e1a66b58441e80e5e2f9d33fb95e0e1ee8d416de1a72d4799e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary function seems to be acting as a link farm to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=godziny+otwarcia+ikea+katowice+niedziela PDF link annotation
    • http://frutapac.com/ckfinder/userfiles/files/47123059061.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9e81f55c39bec4d24a04b1b224a0c8f7/dikeneb.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m4h75t92hnnic11dfk0j2s9r7m/67731277710.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/lomupokuxalexuna.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/25257656755.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/nasexajepakabav.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/tetawakewimowo.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/97566013329.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdac82fdda---55276325741.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/52291087743.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/82865197565.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddd4c703b9---rugomadotusovupawej.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/kopisozuba.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/basojarirupujagud.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/94606733045.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba1266f3cf---jomijinogibigaj.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6019488b3e---varewibasagiginanunapog.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609be013cf66f---lolilukib.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/33711418308.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/vre14bnbd7cva5sbta36knrl7h/subovemarofe.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608861dd46aaa---metiwosajofov.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/sepgsshkmhfmkphovmds7srv65/71310486592.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_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 17928 bytes
SHA-256: 6d98fcddc514364c0eb3662f09d52d05cf0adc4aea1b1b01751add219e8b652e
font_01_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 10584 bytes
SHA-256: c95117a47b83b6ba9a23ae0f8b3603647713511cc44bbaa74804fa29063f5ab5

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