Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc40915e5f01c0ad…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 15:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aadc658fddceb1c5cc1928ca58dc484b SHA-1: be3074ebe6cebd879ded053661c3635868ddc20e SHA-256: dc40915e5f01c0ad9f3b2b0a764448edd73202933bc0fe10f4a0beed7cc86533
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary function appears to be distributing malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=como+conectar+un+motor+trifasico+a+monofasico+pdf PDF link annotation
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4f82a0d71---46383284492.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/botexenezifuxudonatejem.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a609eb642---21838045042.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ee5c87e49e2f5795dc8637876c7ec3e0/16710740310.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/35642931833.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/bunowakotibanogatatexe.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/pesebimusofan.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/raxinetupenuledadu.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/33159735686.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/sojixiwokake.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/49337159224.pdfIn PDF document text
    • https://jjpremiers.com/files/rezuwipozus.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/30379250331.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae94fe7147---metinoja.pdfIn PDF document text
    • http://yanartextil.com/firma/files/takiguxuxekizano.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/75150229818.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a863ee4d870aa2323fbb358f8c741260/93425864850.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/50369601307.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/85731434503.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789e7b01ef6---bigiguvowuwemilexofoga.pdfIn PDF document text
    • http://aa-nusd.jp/38448804655.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/74293447636.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_off0000c939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC939 17668 bytes
SHA-256: 1a19e4da329e012e4ec21ac537c07cef6773c925282ca50960f816715335e881
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 10864 bytes
SHA-256: c1e2b50495294fb294985bdc31e19db11c56b08de95eef08cc335dd8d25970be

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