Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbca920b7fab225…

MALICIOUS

PDF

75.2 KB Created: 2021-07-14 05:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6aeddf88f989446c2599f7de2539d659 SHA-1: 996f6b31469da426937f85d5946f1eb0807f7604 SHA-256: bfbca920b7fab2257f9b7d1a05963d03f175cecf41b31256285b750c2f833b9a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and link farm characteristics further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pjlr97tbk9hdri76iltpv2nfa4/53446609936.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hh4n2shhoam16p95qi6stegr25/29393828526.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c420364c952---namovoguniverex.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/33899641428.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ae2cc45298db33e0181f8965515b7433/buxadijumerifoxisij.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/ludaxowuvofusixetobaxaweb.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079142068fc2---6066393295.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/970dc0636bb385a2d60bc3fe7f4be803/68346413859.pdfIn PDF document text
    • http://hncastlecable.com/d/files/23019078856.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5d5b3a477---pojuzumuvuwuxufixopi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c1221d695---8072636370.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/79561501571.pdfIn PDF document text
    • https://0900107678.com/upload/file/ferigi.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/33100015318.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/39309468101.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/13868535940.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/goguxaritaravodanuga.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb115d6007---vurufasuzoxedupazarukezex.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/zivojiramefisulupa.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/lobilixikobezonatuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=a+circle+is+inscribed+in+a+regular+hexagonPDF 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_off0000c08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08D 10876 bytes
SHA-256: 4690dcbd65bd013f2853bf199703dd1929391ca446f6f6497722a8e00a8c726d
font_01_sfnt_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 17464 bytes
SHA-256: 726ad12bfc7198673e928006cfb8b2fd5341b174255df25b90d4dbec94146832
font_02_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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