Malicious PDF — malware analysis report

Static analysis result for SHA-256 7016c0fd57d98ac0…

MALICIOUS

PDF

82.2 KB Created: 2021-08-07 07:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 326293314ee6fe97734b8e908bd751e5 SHA-1: c54ddf91eebdb4d7e777cd34c76f320efafe08e8 SHA-256: 7016c0fd57d98ac00d9772aa4ebe2e3ea53c85e8d59e620025a315a82ae26d9e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=ejercicios+resueltos+de+probabilidad+y+estadistica+2o+bachillerato PDF link annotation
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/xepikadesesakotemafa.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086abbae9bd2---81414089786.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/tixobudemivisokeba.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6c88afe1---tugolizugivotok.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/01152bc1755ce89dd92d9a71dc1b0dae/guzelulugexukodaviduvim.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c7ac16ace---96987277818.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/24544831635.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/zavetetirikanupirekijenag.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/21121038874.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609452c5f268b---97207196450.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9feed6a5e---vukigaregujenaxuwufumofav.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/14177208371.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091a4c6b82da---87656841863.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090946db1251---rojukibigusevitujufiril.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zupunuvilopubovukalikup.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210623230351_a14lj2.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/43924475633.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/vofar.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/sekuwoxaralu.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/fosol.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/19031447938.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/75003301505.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/33855363532.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_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 11096 bytes
SHA-256: 1831a91d0c910c8bcb728fd5ae85ea980458d60e082b8d6e8f17a22e83724a06
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 18020 bytes
SHA-256: afd748d1fb7c2bec2ee1d09d12817b04e84e8ad75eccd9853035734a7cc606d9
font_02_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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