Malicious PDF — malware analysis report

Static analysis result for SHA-256 e406a06b1f29873a…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 08:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 752713b09512b0b560a4570e60b25fe8 SHA-1: fb77cfbfdd8e568919e041013f44c0352347b9a6 SHA-256: e406a06b1f29873a347085740df24d5364fd38d5e4c557d29ac94b061998940d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to potentially malicious or scam-related content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=audrey+hepburn+80s+fashion PDF link annotation
    • http://clairvoyantinfotech.com/demo/images/20176076936.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/danimawuvubemulibi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/6p64vav0k5jhte3fctilomq58k/62170233614.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/56632530446.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/28462066622.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/kamewez.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e935e0737f8515496fa30f3274494da3/56519266588.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/54125547341.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/299d3facd31fbbda67144499c34f6499/16299482820.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/93880289293.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/60027862976.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/43568977870.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/3653295278.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/51708832315.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131babb2e534---6288095979.pdfIn PDF document text
    • http://centronegozi.com/public/78725185285.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/63619601839.pdfIn PDF document text
    • http://beiks.info/public/file/99577650547.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/nuxujun.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xodugijedevuwemetepoxakoj.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/namexozajinedov.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/75690572968.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/deforitajojoje.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3c9b7a387706aad6f6e121d1cc2240b6/60837499812.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-12/20210912114442523431.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/sedewiboxujo.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_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 19152 bytes
SHA-256: 61b0a2375f0967d0696dff4e825d7ddaa5026201df274c1494c0326756b4890e
font_01_sfnt_off00012410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C27 11116 bytes
SHA-256: 2ec15f9f94300b36adc02781cf3d1ce7ce44220c0223f7b749122f2cc30afddd

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