Malicious PDF — malware analysis report

Static analysis result for SHA-256 903dd19910c70e78…

MALICIOUS

PDF

83.5 KB Created: 2021-08-16 10:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9812639211a0e9020a8fea47fb91cf3 SHA-1: 027d461c122de2191e4cc2d123b9a01b47ca078f SHA-256: 903dd19910c70e78b2ba1e50dd46b8c6efee6f7549b4319154d81af8fd4de55b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links and the use of compromised infrastructure suggest an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nacyc.jp/Upload/file/8405839377.pdf In PDF document text
    • https://sieuviet.net/webroot/img/files/88767995486.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/30100288020.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829d2367796---gaxafodan.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/nuzodejopafekulujimo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810ee70dfd5---negaxominur.pdfIn PDF document text
    • https://iltuosarto.com/file/mumulegofofajigurureb.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/91245657254.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/20895902824.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/girilazoxeboxetuxizaba.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/jaxenes.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7db8a953---28294120516.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/22046351349.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40d35071ef---96390434577.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/gulubutidevexivesol.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0a81e06d---4930203807.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/3k43lilmo7s9k360f131gt0gj2/14128666399.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f321bea9cb4---75142796188.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/76912789385.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/bilapubizedesowijarexu.pdfIn PDF document text
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/sabuposinefapatiselokof.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/fodagumip.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/razogizuraredovag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=captain+tsubasa+rise+of+new+champions+requirementsPDF 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_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 16940 bytes
SHA-256: 967a18dfc4b194f688094055fa2caae7fb98b705e0b005e0367d69ef5d8bb548
font_02_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 11204 bytes
SHA-256: 3c1f915affe777b4ae2f433a977e052506bde3b5bfde31303582fcb6afe37c0c

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