Malicious PDF — malware analysis report

Static analysis result for SHA-256 04775fb8984bdb0a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 13:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3515f14a8570bd7d9ebbfe2c3301a61 SHA-1: acc29147b7b62b401777ccb9737c3977cd3141c9 SHA-256: 04775fb8984bdb0ac4cd53e2ca3be798cb380984b2e809e857cb62750c87f75c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=octopus+pubg+lite+hack+apk+download PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/90b864f614b8ae4310016efe3bac52da/34586563124.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/91356469265.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/kuledofezinadawogurinur.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e2270c8d---93603961305.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/36485991846.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/timodipivasom.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/wisudasolibit.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613578a29ad76---5427244842.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/voref.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb3df18fca---801994441.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/sorevikidal.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613958b2d4b6e---nakonukigemunimibume.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/26975543279.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/benitiwatuxujixuwo.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/maludizanijemetefuji.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/31171211331.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/17970048658.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/retoxexatalogakaxerexawiv.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/zebagumuxidiwazomisek.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/pavokubiluwejuxex.pdfIn PDF document text
    • https://seger.cz/userfiles/file/98050950100.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/73952492878.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_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 19272 bytes
SHA-256: 0e2940a087a44885ab3423f479b5b2207b456c134f23b6bf48694f77ced118e0
font_01_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 11136 bytes
SHA-256: d294e9d0065a84bf0502f6c3cdec85f1efcd00cbbc83dbdec9eae34a373003d5
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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