Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43081e1441e1fc2…

MALICIOUS

PDF

83.2 KB Created: 2021-08-26 04:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 43351f23df358a23e880ca01f2aa2daf SHA-1: 06cf2d995c66dc2e7efa0fd5f521d0ad038a03f4 SHA-256: a43081e1441e1fc2e7d351000add1cdc460776f115fc1a343346074de084d536
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://archism.ru/uplcv?utm_term=example+of+subset+and+proper+subset PDF link annotation
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082e80fbe78c---kakomemiweko.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/laxasobelikofuwid.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/nigufedopupexeredexalepol.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/jukesewi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608632a71ef19---53829708340.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/xubekedupimene.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/jagumabiwasopemenow.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/podasafasewejenoxowek.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/xanarup.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c382b4c9---fekalovitutupaxexapejupat.pdfIn PDF document text
    • http://altinay-law.com/images/file/wasoxefiwinigumip.pdfIn PDF document text
    • http://benrassam.com/uploads/files/79835618922.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xuzakekagu.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/sobopoduzidugu.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/48839545195.pdfIn PDF document text
    • https://tomas-music.com/contents//files/didas.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/832c678ef81c2b146037e9223ad64fa6/8742573261.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/94323b9538bf42d68a2bef7c9d320b83/56804376900.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/mitawonimisabexovivir.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/junotapefavob.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/64830813128.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/67566134324.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/28235430119.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2bfe0a43d---dugakeravupe.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c908801814---tatigurelofulo.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/dives.pdfIn PDF document text
    • http://simonide.org/userfiles/file/15940909100.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_off0000dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 10892 bytes
SHA-256: cad08c272eb7b52dcbc06c181e61fdab7d7b31aaeab50f4583b3cf675cc21383
font_01_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 17920 bytes
SHA-256: 90d5af54617a901d04ead6dfbb234126a93542cba4e97593b70554ea6fee17b3
font_02_sfnt_off000126e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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