Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdc77996bac9ac2…

MALICIOUS

PDF

99.0 KB Created: 2021-09-05 07:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ed9cb57795b4745c73ad3926f2b5e95 SHA-1: 682302595c58def7e69186ea3ad15eb3911af69d SHA-256: 8fdc77996bac9ac21a53309fbc2e85788150c63432644340b9d1c1c23ce45542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards the document's primary function being to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://drafthe.ru/uplcv?utm_term=law+of+conservation+of+momentum+worksheet PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f0185929---jawufumurebuxesame.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/zetusamego.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1ddc11946---19645105184.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/pixedejereliko.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d1213d1cb88d7c1ed4dc843bbc012adc/57959579215.pdfIn PDF document text
    • http://deauville.ru/files/file/99690778022.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a575f5a9593---14013106244.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/26400601088.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/35535643386.pdfIn PDF document text
    • http://devison-matras.com/upload/file/lolatokuviwuvifelurej.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e68ab259---vikomanoruzitumewifete.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa7ccebc64---jubeleverukarike.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905bf75a9b---gawawututujuxuful.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fd412537477b7e9c69aae5eb02a7c48e/tefejazijiziwo.pdfIn PDF document text
    • https://afayl.com/userfiles/file/bivuteburulub.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e0f7fa4e3f---48669049563.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/sedor.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/nufagofuvirurivizom.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/38527217407.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7e0c896a---96666958178.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/kibatagexaro.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0baa0f78c9ceb5904cc52d69379e2c6e/20950323702.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kizesenafati.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1abe7ff6936d55888fa55df0afa5a1c8/66178262313.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/juwukedixud.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_off00011ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADA 10856 bytes
SHA-256: c32c21225867af32e9f26401718e87591c401983d5769ee923f15ac2accaac8f
font_01_sfnt_off000133d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 19004 bytes
SHA-256: 2caae8f184bb6ec31dd068e2feadade15c84527c90b99e11f284cc28c067636f
font_02_sfnt_off000165f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1