Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9555966da5c758…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 17:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ee8af80cec83ac1e9515aa3078af5e5d SHA-1: 8fbe6e4d43da1db9daebf7d69b65181e003c2e0d SHA-256: 3e9555966da5c75899856100b5bf4ba3a4992c71f9aa6d507e10c050b76972eb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The presence of multiple external URIs and compromised CMS upload links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sls8g79ilj51m8so7br6i8f0h5/29581871021.pdf In PDF document text
    • https://eviinstall.com/userfiles/files/bawozaduwig.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/kafararugabowani.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/apgn32trhtalskoeg7uemqs2ce/xuxudaxarebezedakepeko.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/v2nprg1f9ph4os8o9ope72g0rt/45574085722.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea8b6e2cb3---45421092945.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3bc7a08a---32638775682.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/35c0ac9d7471b001adbbf5de3fc063c4/1336209564.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/pokodanuno.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ec223e23---motabubadidun.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/605f1htfg0viilnc2ganu08b92/93282935434.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077710101a9a---muralasanurug.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/jnhiulqluppa5jq59hq316vqpn/24344535464.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d98886127---maxakadakasu.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0762888001620290035.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/50a1436d2b08797bb856c3b76232da20/85078434316.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd9f38b7fc4bec2c445d25140c975b7f/dogef.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36mvi0b6otujh4cli2hr46g3a7/runusamudivugikegope.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc883cb9b5---fesulon.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/zagujateg.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/22085c0ba7d35931b0f15887ba536d06/36290718023.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/db4ceb9b2d792644c561547c4ca6f06b/venerosizufobututaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=after+effects+stockPDF 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_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 17372 bytes
SHA-256: 6437bad89354e6320f6f9f1b2633c103243cc107b6d01716ba23767315c364f8
font_01_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 9996 bytes
SHA-256: 6e9c0463dda3a3848729cbcd20bd35028aadf069926e58ce26abd99bb8907854
font_02_sfnt_off000135aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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