Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef53d9dd85a5e83…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 08:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 614704d88534ebe2ddd01ec2b4d53976 SHA-1: ea89211d50c024df3b055ac4610d3e1941afc184 SHA-256: 5ef53d9dd85a5e8382b47f8e8ec78852b6b26ade5577c749cd87c498ee00a737
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress uploads and disposable hosting. The embedded JavaScript likely executes malicious code, and the link farm serves to obscure the ultimate destination, possibly leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://phdpecs.hu/userfiles/files/vasixezasetuvomapatupaf.pdf In PDF document text
    • https://thaiwoodengames.com/files/upload/files/31730938097.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/43987111562.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/fufenedutaganubekorenu.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/95479269429.pdfIn PDF document text
    • http://melvin.cz/data/26563740488.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/92388295751.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109070324205163.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/51604166048.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/65537631463.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sqldfnv1ja9e10rmmj4vsdrtl0/46857544590.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/gazuzopirixofavuwipanu.pdfIn PDF document text
    • http://rjt1.org/upload/files/nimuxiwanivemeg.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/nuwuvot.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/14f8f2b4416497c2968477e3492d1087/xazasopuzuxomomobo.pdfIn PDF document text
    • http://ch-yang.com/upload/files/36944475642.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/20b2b3acffd7453f114eaccb40793098/dugipajatezoka.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613533b13c81b---pewixijomebiw.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/bapogikugizepab.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5aae20cd43a8f79146ba116896b8164c/goropopozew.pdfIn PDF document text
    • https://ewt.cz/res/file/demakukofasokedidivexof.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/lumabanusipokozopos.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/21220608116.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/ridowowegonesabosozibosi.pdfIn PDF document text
    • https://halead.com/uploadfile/1631346270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bangla+cv+pdfPDF 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_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 10204 bytes
SHA-256: 01a63ec2a6c0af8522ba71e08e481aa215d1519f3dfc218672a0aedf8f793f1f
font_01_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 18728 bytes
SHA-256: 55983b4037bb1a8ef7284b622faf0f57f2d342749183caf15f2535f64e1733fc

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