Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b53159c59d9373…

MALICIOUS

PDF

102.2 KB Created: 2021-07-16 13:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5f492c133ece5d514ee36a9fe893fba SHA-1: aadf5e9accf29453adc5856344add57e94954c36 SHA-256: 44b53159c59d937374e58e40a7c96833c4a2913d89facc6f9fa63bc15ad7332f
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://irlanc.ru/uplcv?utm_term=congrats+married+life PDF link annotation
    • http://chrisdepanneservices.fr/Sites/cds/files/juteraxonizubazeza.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/tekumapumekanatigijek.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/subavudesosuzi.pdfIn PDF document text
    • http://brlairport.com/images/file/16066794655.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a159e5d4841---17147106601.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/sosikasom.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2f7b1356---91281262198.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/zanawibopugomupufu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8725d05602c58d91d9661fd8954f28b6/40259093207.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3e314a5c4---rokozibubawamewi.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/ralogurejevi.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/xegiverokone.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a936ebfbc5---mekirutovijam.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b1f63a10e---21875672961.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/b2410ef5ffeb3cce6d3db7af30fa264a/90425454741.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/740106dc572dc63b8d1c13a7afddf9f2/97074123275.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/57292188095.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/sixaretogumizuzajadonet.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/cf0d112d7ca3db87e43ded037df0b79c/xamalereroxasevaridugag.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/46f6849ce5f6fb4a673a5ddf09208905/53743525398.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/61020415793.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085afac412ea---78811858033.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_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14539 17780 bytes
SHA-256: 1ee4745069e48d3f09602cb666aa8715ce8fb0168a3b980896fb17a2f5f665dd
font_02_sfnt_off00017353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17353 10728 bytes
SHA-256: ec587d39506d2a32273adb328eac0715a9999ff88acae6a21db9c43e2df86ff1

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