Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e7e1fdc32295a3…

MALICIOUS

PDF

80.2 KB Created: 2021-06-12 02:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1ae0a478da19873b87db43665713d06f SHA-1: ca3d47ee8e704de089cf9ea403b7f46a743fcbbc SHA-256: 37e7e1fdc32295a362b8d42d754ccd167fc6f9e678c5f730b7e2096e6c4fffb9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or SEO poisoning tactic. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=plants+vs+zombies+hack+money PDF link annotation
    • https://didacostruzioni.it/userfiles/file/88649639378.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/k1fbsm3v6ve9u2t7q1i0l2ijq4/jevujukerabomod.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c320041f---sulomexaledokutovigip.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/sroiucsl73acak1q6ulst35klr/butunotudutanepapax.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/65845268889.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7e4a97d1e1b84f58c8748a5b5e71e98e/56881262827.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e7bae5061---39621162382.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210531024156.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/zonamafoxodiwexeruzejir.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/4iephq3rkm4gu9r2ruq8aai2b2/2889323062.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/94477297010.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/s8adg03oitcpu8r072p0p35682/30632253499.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/9e61629f1ba9e0a68dc17d6345f08ebb/59903901813.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/63evd46s7dhrgmndlacae7uq4j/jexaxomotipabibu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ed6714f6---28782863187.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f328001ce3---4480435505.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a74df1e6d03---82453448024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 5148 bytes
SHA-256: fd8426e2eef78cf560eacab46eb4110616e23911b6f37c89116cd33ed3790b7f
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 12280 bytes
SHA-256: 786dfc96686479a30b0d4d6210ea59299c89aca377c25eabf35b1170dd6a263c
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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