Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aef23a91f578bd5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 11:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66ba930ea6a4aa95ef27c91c73e2933a SHA-1: a94669866e22d22c7f8f87f95ba21fc6660ec878 SHA-256: 2aef23a91f578bd5d04e5a108a6fcc94a102a775f9a7dd292e0557e334c38fd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised. These factors, combined with ClamAV detection and ML flagging, strongly suggest a malicious intent, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=atago+abbe+refractometer+manual PDF link annotation
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/91533934100.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/lapuloraso.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/18555984552.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3a131ef597dcc3572a9937d6a5aeed9f/sebolesutiganuvo.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/71684767466.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/gaxelulojabusufilutilobu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730af9982a1---sikisatukov.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ca00c2fe8c99bbd6be2253f788c13e9e/99085526468.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/83339998116.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a15811b41---88515298875.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/povakurabad.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/petulakowifesekofepak.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/17941911619.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b40402758cd---979852238.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d69d3fcd249---gobizajulesirekex.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/39305070057.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/kikubetijaka.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/jiputitonepodonu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f28ddc4b---79094833627.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/zixojokotazerudijobotoduw.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/cugidk145tif032i7q5v73rkbr/vajuzibusixafonumit.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210815090541.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_off0000c18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 18000 bytes
SHA-256: 121039f44e60cdc872b65f823e971acdc1bf857411394417d3e9898856853b25
font_02_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 10640 bytes
SHA-256: 8ca74a92b73d0af19ac7ee7cd660cda418ce9f31737bb00fd2a55d8c12469c00

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