Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d8b60d68f37f50…

MALICIOUS

PDF

84.2 KB Created: 2021-10-08 14:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b865183d71248def6444927c638ccaf SHA-1: 1238fa8785336731c06eed9e316c3351dbb8cadb SHA-256: e0d8b60d68f37f5074977bded12ffce12f57508d9b9bbf268c24ac10fec00b6c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its immediate user-facing content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://papienbanana.com/user_file/file/47204329920.pdf In PDF document text
    • https://fa-vietnam.com/webroot/img/files/35305469503.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d7008a2e87---90396417143.pdfIn PDF document text
    • http://espicycooking.com/files/file///41022409203.pdfIn PDF document text
    • http://cutskytools.com/d/files/zulubaxokavakomonunorolem.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/37550737684.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615e627ebe5ac---rovapomevixorogegagotafug.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/812d7ea032bcee8d2ef8eae77fe37154/xarixizulofi.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/dijulafeso.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/wawewudiz.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631595265_25fe45b082.pdfIn PDF document text
    • http://servmed.net/userfiles/file/metobuzomuvu.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/xixanijozo.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/6647664644.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/19603761797.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/44804133743.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/zujeromoka.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/bedefetufoxidaredaguz.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/tujefujitoruwepimir.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/90962991786.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20211006113245.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/175674db15229d5840ddf37403439848/90924007799.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/watawidenakotoderuti.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/69871872060.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/062e0d92b2dfd48719f91ea92adfd4b1/daludige.pdfIn PDF document text
    • http://htwy.com/upload/file/34104239313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=need+for+self+expressionPDF link annotation
    • 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_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 18224 bytes
SHA-256: f1bd0dbc6c05b6415babded9b1dc649ce6d2e9c696572495d9341cea06b0a23a
font_01_sfnt_off000113b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 10312 bytes
SHA-256: 229f68961c207dc0ba3a82ae07936c6443708fd5b6ca1ca60d30e5e925f26334

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