Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e462327f6d5b8ae…

MALICIOUS

PDF

85.2 KB Created: 2021-08-10 05:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10d28d43841728b57c90d5ec4ce5652b SHA-1: 3c3f9ed2ad82ba7ce8cc0311fb5ead9f5d029139 SHA-256: 8e462327f6d5b8aeffe25df3b69c24112555463c937e75073737010bac080520
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_FAKE_CAPTCHA' suggests the document displays a fake verification prompt to deceive users. Numerous URLs extracted from the document, many hosted on compromised CMS upload directories or disposable domains, likely serve as lures or download locations for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://queure.ru/uplcv?utm_term=naruto+shippuden+ninja+storm+4+apk+free+download+for+android PDF link annotation
    • http://faizleathergloves.com/userfiles/files/rodekujijifalurixuw.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/49ujv8d6apon1hc3hpvrf1itu7/83237816310.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/fopaganadeloga.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/254tf9ecpp18fsa0hnmn4invf1/14456798877.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/lozus.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sm8thbs1c0mbcerogf954ja6v0/20933278371.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc07bd750---milefexutenobezujomox.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210704091926.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e3764063998---1868922053.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/mireperosiwij.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/30ab49644129a2d5dc28609fa4731c35/rizevapavukasarosuve.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/27150808256.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/wamejojugojewiwixidu.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210723205201.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/14985003418.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/8761439714.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/82130586899.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/4584215900.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d0d2c2379---sulozawarokuxaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74239bb003---gabetu.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikebesotowobagazizuvup.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_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 17024 bytes
SHA-256: da25a6ecf7522c62f1f6d1d2a7f32459a41564b77735977a1cfb6beb967d8c3d
font_01_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 11228 bytes
SHA-256: 27e76b928a582cf3c234acb5ec7f9b0650dc81331311134b86ab2bf7667dfd32
font_02_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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