Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00f4ae4e6d21522…

MALICIOUS

PDF

88.7 KB Created: 2021-08-18 09:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94e1689a522d4127723a968ff073e6ee SHA-1: e9255b262dcff4cca43afdca5c3d00a56714c99d SHA-256: b00f4ae4e6d21522ee78da88c6822c1edb0eab9d677c0169cbe7020ca0ffc9be
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://le383.com/uploads/files/luziponagawowimowor.pdf In PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/polaxifagikozuvemunozuli.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/889ca56bd9625ef3c0cb2f67b9919fec/38005915972.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074531e57d19---36219801877.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c23c63fcf3a972bfa2bf4f61a3318773/wiwisadibepisovixi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d9700d1b8fb590c63f7ad31a15687a14/60047328119.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/61647903915.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/48272115151.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/wiwopibuzajopobilisere.pdfIn PDF document text
    • https://anfauglir.com/images/file/kovuzapat.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/vamadolikizigaj.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e0b062ba---bijosaxalikugik.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4303cd47b7---83499103030.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/bamizolumesowinepuged.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e49f1b46c70---peziletuvixepafelojizemon.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/99921406985.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/vosanu.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/jexojoxuko.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/835df8f040ca383586b358b9a406303d/gojefibedawa.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082485626304---21319063882.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/24149551791.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/26634642427.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac4f84e827---paxokozoxufefelefeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=2014+maxxforce+7+oil+capacityPDF 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_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 17040 bytes
SHA-256: a8518198d64330bcc847e461dae4bb54df4d72baddcd32f1448bea6a851b8705
font_02_sfnt_off00013a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A80 10912 bytes
SHA-256: dac0015b59a35ea9078c159bb3e790282e74509ba518a9b344cbe87d3b6d4355

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