Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d14b1ac9fd3dad2…

MALICIOUS

PDF

100.2 KB Created: 2021-06-29 02:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: de3e766b550c372e7aff790f06cccfea SHA-1: ec91825bf3330042b6bc9c961520a0ab6815cfc8 SHA-256: 6d14b1ac9fd3dad269394e8398a5946f3a962ab3bb44518b3999144d139d48bc
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The document body is unreadable, but the presence of numerous links to potentially compromised CMS upload directories strongly suggests a malicious purpose, likely to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5832d5eeda80843df504c5b51303dfb1/nijefalo.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7379c1e283---6472924368.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b65aa123bfe---68021664300.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63e484ba8---redosuke.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/8f8f300f95413967ffaab0bbe8c495cb/gitosafatetuwisej.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6e79407f---81229451680.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/tesipopewipurizid.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/kipugovijuv.pdfIn PDF document text
    • http://abnicum.com/files/file/porowajukuxufe.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/eb5f5238ae9237cfc4ec1815f3bacbbd/10748933717.pdfIn PDF document text
    • http://vce34.ru/attachments/file/56685530529.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da5c80063---96807602866.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59db4048d0---7437053259.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/80795090801.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779374a41ba---10653567463.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/85b8c380ab72fa4aad553ec79b684735/losivupuxulexivozebilabu.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56873066580.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f1c9dc074a7f0ff81242f6c35a29c8ad/lejazijelolerega.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15ce7e712---99865443339.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/zulusi.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xedunabevexovoraw.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/73890d21bb020ae9af1f1cecc5509d01/70246531101.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/votutawoneveronigunateg.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/26838071152.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/1810330786.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f1bfabe9a---zuxikeson.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=css+label+widthPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 10276 bytes
SHA-256: 0c4ee57841a1f4378b8eca1c51195d2c37c60bb55c87cf2cc5926b9d9a5c55f9
font_01_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 15572 bytes
SHA-256: a10edfe7e3ac6e71a170fe2cd923022f5fecc66e7fb4c4b8472292167f8f90bc
font_02_sfnt_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 34076 bytes
SHA-256: 73a9882bba453160040f52d0c73a90802986a613bd645e4a5f4e2443ab5481b2
font_03_sfnt_off000167bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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