Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65e8923b20eefa3…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 16:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 63c4bb31d14039c21df2bf9a75dcc267 SHA-1: a1999e3672a89f21c04b32a12b5d228a1085a038 SHA-256: a65e8923b20eefa3ce79b595bc7ef1c10d27b5a0a9369272d263d6442704c0d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector. No scripts were extracted, but the heuristic firings strongly suggest malicious intent through URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=eating+spider+crab PDF link annotation
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/589kpmoh73mgt0eioo0pvhd5i1/vopagakixadowunakazogosi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/57342588715.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8becb481be---ximobexujiveluna.pdfIn PDF document text
    • http://qa-whg.net/upload/files/21122859990.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/fe6882373f667b4014159c2835b4d68b/murixodaxubo.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/76250563543.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/90v8h0ocebcso6a6hd056053t7/90257729876.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/5093668a522ba9c0fb5b5760974f2204/dalibimosunexil.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c7ccfc4bdf91d34071f6cc746409fb52/nixupuw.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4717df4ec---poxikiwipi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746cc80acd5---xobuwoloxepubeji.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa116ff3bcf---womonulotuvepusujenazunow.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/vnullqhtuc8dkcmc5i46rtp9e0/91535789017.pdfIn PDF document text
    • https://fong-cai.com/upload/files/81892715758.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/94968692804.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a160989a37d---71314208953.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/6e1qtm2elhccmgqt5k9962l3sq/ropokugaxugerojenuratis.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cedc1b39d61b9381defc8dfbf57efb85/3115236044.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/22a93a608ac7e27c7a74a0570c8b2c6f/jetijexuperegoripa.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c380d9da4fb---sinigapotukowo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ad14658e2f6---pigowozasufezawufiraji.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/jijafusodotu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/abaf6950faeb45f8acbc94bd1cfee1e2/latekoze.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_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10644 bytes
SHA-256: 8dfa63943232ce6cf255b6238809dcc1ab6e911dbe325fda80a8a781a94cba5c
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 17288 bytes
SHA-256: 97ecaf1a1ffd2f9ae875578547196ccc637c0ce2608df94a5b20ab35997574c1

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