Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0bce9b618372ae1…

MALICIOUS

PDF

88.7 KB Created: 2021-09-07 04:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 08b2cc4a7a16acc76f62f7abcc26b1b3 SHA-1: 40db5885f9ce5e665783c33de6128ec8bec8b7f2 SHA-256: e0bce9b618372ae1da455557ef02273181b725128ee1b4bf8dc76093721548e7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external PDF files, many hosted on compromised CMS uploads, suggesting a link farm designed to obscure the true malicious destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=programa+para+unir+varios+archivos+pdf+en+uno+solo+gratis PDF link annotation
    • http://ivelinabozilova.com/userfiles/file/neluredemodixa.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622349764.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf35c47ad5---demukumoj.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e693a02e8e---90058253421.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/telokexolesovunavum.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a762654b9c73b56706042482a3083711/wekuzab.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/59401100690.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/virako.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/70609096113.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/kulixage.pdfIn PDF document text
    • http://azizolace.cz/images/file/23663505025.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786ae68bad2---ligofubedokewi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa66412cd---33996183412.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/97c62cea8bbf922582485c4522b5b9f5/51812701637.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/82568953852.pdfIn PDF document text
    • http://www.pvvc.cz/files/masisobevoxalenuf.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2d34a5b1cbeaa0dcb19980f4efba8a15/guvibajipekuk.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b647b5c545e---meguroluwiruwezuwe.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b66657a92---rejalenajanugen.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/jekuzevudufukelovuragexep.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc610b55c02---veloxojekekukabowudugelo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1339417224---46114047389.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/pasuzigilodepi.pdfIn PDF document text
    • https://cardolf.ro/files/84182732607.pdfIn PDF document text
    • https://tavio.ru/files/file/tatetedubo.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_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 11232 bytes
SHA-256: 0179149249f427599bac285336a5bd831860d31e67568a1d3b3936a87f3a9098
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 19304 bytes
SHA-256: 849f53e201f2ac9c0223f0b04557dc904beb1a97a71b4bfd2bb9adec5e952985
font_02_sfnt_off00013c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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