Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b231d366806d9a8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 20:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87955512cd0cb899f58cc84382d3314b SHA-1: 57724210c81979bd829ff8a290d0dbce7a1c4c9d SHA-256: 6b231d366806d9a8f61c1fd8924803065ebe14f73ed9f6f7efe29d856887785d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=matching+shapes+worksheets+for+kindergarten PDF link annotation
    • http://nordicaluminium.ru/userfiles/file/3679510401.pdfIn PDF document text
    • http://centromp.it/userfiles/files/voxigusofotop.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/dagep.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4b6546f5---76382111142.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210731_A48689D9DBC1C030.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080631d1a9d3---bedibul.pdfIn PDF document text
    • http://hanleyresources.com/images/sigimogawijonigavejez.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2fd2bf4c---gutuworotebufepini.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/8617854192.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2bf4d4a4ae713b5a59a2d9cdf79edfd9/82229451318.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c45f567ee---53552409680.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2050ee59f---fudatokozorafuveliwunakar.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/l13l2k7tsdo7j45u7c9r5jpbki/gipevixeji.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252aaf4bf---75839948036.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/7815b2a7e2370ab56612a5dec36bdcdd/mapezimezagulujukemupas.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a569d4fca39d958b2f4ad91ef8ad1e0a/62738869834.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/23775807399.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4be00552487371f2097505953b2976dd/fipijeroxuligarujatepegot.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/14461060976.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/fumonesanimojefises.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j22pianvnraff2ue9556h3t66u/rilenufupufesogonimikaj.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/651vjps6dujlpj8q00d82qbj57/faroxopusixarive.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/74711250005.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/pepanolupipuwunaxevazalav.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/15c27d4c1320091196b3fa8076c2d3e3/50903517434.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_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 18024 bytes
SHA-256: fa55ae2e0c8a669990dea4389704f81a0da11e065abac36a681c6f5c7b3e49b6
font_01_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 11024 bytes
SHA-256: b995ac9c48ff987cf8b8c59d79f691a1a9d0d392fabca0a6ba40f19ade8e332a

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