Malicious PDF — malware analysis report

Static analysis result for SHA-256 9806a235675f6847…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 17:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4af5d2ab2c97ecf347ddff1fab919d5 SHA-1: d376dd8e44b07ca5d34234c361d572b7c9c6afc8 SHA-256: 9806a235675f68477d6aae542ea61dbd00a4ef4fddb2594929ee6c31198f0ea6
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drticket.ir/basefile/drtiketcom/files/vavemudevaja.pdf In PDF document text
    • http://zgic.ru/!upload/files/79325199571.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///sujavolus.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/beredasiki.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc79cef30ae---xomuzupetugesudo.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/9ndsgjfnqa3vncd8akqv6jv9mb/kilofobubodumonisowa.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/cge0b9fei9ssnkbg8fdggkf6bp/75988707033.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/34776144436.pdfIn PDF document text
    • http://chinalabware.es/d/files/64618041562.pdfIn PDF document text
    • http://imaginove.eu/data/Files/78310011831.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/pisun.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae4d8e49c1---50014047917.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/80935292749.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/16550812438.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f8d5fb185c114ca2b37ad99544007ad/divozajumasa.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ko0jkj91506jajfgb49locqb3k/sogodonezirup.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/rudukapedun.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd16614309---80225495042.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/dc7669d9bd8903dce3b3712d5ed51642/8764299125.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/nugawifiritatigidon.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/580255e8e49f1be4bfd819d5d0056be0/81970089088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=horror+short+stories+pdf+downloadPDF 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_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 10672 bytes
SHA-256: 57e1861bb7fd0ac9d4edbe49710dcf160025fa5306a197f27840f36a0e56bb37
font_01_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 17880 bytes
SHA-256: cbc3e381da2b04157a41508360d4c3ac7164b1281dfac7a20af9792d12942cae

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