Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc6c14505e6fe67…

MALICIOUS

PDF

92.9 KB Created: 2021-09-06 22:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d16d1b1ecd11bf7196a038d410bae47e SHA-1: 2f135a8732f2e8f16d2d2cc94a44e9ad3eddf1f4 SHA-256: ecc6c14505e6fe67aa59c4569033a4e2b3615ddd70bce3a59250279afec53762
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=jurnal+tentang+pembangunan+ekonomi+pdf PDF link annotation
    • http://cuatudongbinhduong.net/uploads/files/jovewizeza.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3f910bf8---sosim.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/tonunijamivemaz.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/forujejodajan.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863dd908482---lerafawirokosabizaziwi.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/semexotomasuzizepupirirom.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/99317671387.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/wuborugakex.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/74153301179.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/wudazaderagizijumibedifo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/13253981279.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/92421538367.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/4d448149a2defaf8f782ca11c333059d/lokiguzalilebapebojopita.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd66c17d96---94413614554.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/xibofuxamiximu.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/78989580260.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/316f4ebe41527031aa353c3ac4e4f6da/dopewuvizudimotebozaput.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/99615421284.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/89162618599.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/f4qleb7mtsbejsdg45rrtr4uv7/wutular.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/fetobefutezelatuvi.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8da4602ada0b61eaa7e83b9948b58afc/84539179422.pdfIn PDF document text
    • http://abwva.com/uploads/files/jojifoxusi.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/49517640723.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/kazamebefare.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_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 10996 bytes
SHA-256: bb81c5d1d5799a32afd7ea8ae5945d83e330e97749ae39409678e7945d7b7470
font_01_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 17844 bytes
SHA-256: 4268ad35e3e7d1b1a05ec71ddfa27df004cc6bbc772ff2d750a4b8e3ca6de9f2
font_02_sfnt_off00014d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1