Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7eab74307591478…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 06:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 699f36d4aa14e7cbd32f29052b5e6da9 SHA-1: 95569ac64f4cfaf6369777ab99ceaf2df0d0ab4f SHA-256: f7eab743075914788040ead75563f2bcd05e84f1a555d49768182a8af5ecce87
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing metadata consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://cructi.ru/uplcv?utm_term=mercedes+cls+2007+manual PDF link annotation
    • http://jewelry-shopping-city.com/uploads/files/202108140944123735.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/nimapevas.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/49815940306.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf5b8b3a3---pivezexibunukufetavavadat.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210627_AB24C26233C483FB.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/78217735289.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/41119795809.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/xesula.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2c4eff0281ab740f290d975d1b0cec59/68758064195.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/a4ge3g671nth3afglobsohslo4/75514733324.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088046eb2e75---sovobajejari.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/fb8a9373235c274aa18c05c897ecd685/16654981241.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/zodatefivaziw.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/82867335951.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/883684dc7021d711d293354b51aa3237/lefisewigixarepiw.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160760e96befbe---79546178757.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/tevujibutulefoze.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087350630838---96270682655.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/xonojosamusax.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/8261e7029e4eb1967cbb0357c7ad57f1/fapajoxugepakapowex.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/52990449346.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/69139508881.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/97440300045.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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 10608 bytes
SHA-256: 1ab5a24b0c291adc25e9e8ffdf600251e1afa6e2e9ffa99947bf86f1384359c9
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 18988 bytes
SHA-256: 952796a68e75c2ea61d17a238c090ba0f00ece191c7452f2b1a734420bff4a36
font_02_sfnt_off00012b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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