Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf5bd41ca6bb909…

MALICIOUS

PDF

94.1 KB Created: 2021-09-18 21:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86f479778690a433225dcdbbb4eb63f2 SHA-1: 0902cf9f3659255b475229944e91d817c875ab4a SHA-256: ddf5bd41ca6bb909b1afc15c212e01080a59f229f9529cc52575dfa194f23eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=download+7+habits+of+highly+effective+people+pdf PDF link annotation
    • http://metall-press.ru/files/rununuroxadejiravefud.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/cfc121c3f226e1207a9e7fbaba452add/17288979995.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/subozizomafow.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/gubiwor.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/87411825051.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/48792296228.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161437ade9eaf7---54846890278.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/lumijibowejosavul.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb6442408---wogedubifebanolunagozol.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02aba6044---muzesu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5efea685---xuvonenobejejafor.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/2184604154.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/nugitavukivubegupu.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/70744819492.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/gofopiwepagoreb.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/xipetanomivaxaraxevope.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/885a26f1889e1e47b6d52fdf8e3e2f6b/99884694527.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/15727474195.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/lezifiwuxubodasugonetupa.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210910152458173799365.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb1d287cd3---julimirisurojazuvi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498993f671---7242721250.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/gurisekotuje.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95d7041b0---zetekekomawafamemagadiwig.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/18403928154.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_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 11256 bytes
SHA-256: 2d7c7c0099b0a276dfa62ac976542717496c08fe1b882cff551dccd37fc17749
font_02_sfnt_off00013958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13958 18628 bytes
SHA-256: 93d9cca3a4f039b2a44a4bfc42c30ce50b9e18b1a8b47f8c8d36bc3150b3d747

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