Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b35fcd5277500c…

MALICIOUS

PDF

97.8 KB Created: 2021-09-06 11:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9f885ecf680d0d1a5558180e3a01921 SHA-1: 73bd3a4c81b3b7230224fc0436c429a0a07bbd13 SHA-256: 76b35fcd5277500c6751477b91e0ea6491ff40963b3b0ed19c47b914c16adc01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its numerous outbound links strongly indicate it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://machnik.net/ckfinder/userfiles/files/92103005120.pdf In PDF document text
    • http://kawana.tech/userfiles/file/zujepejapajinabedila.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/14d4d3a84c3dc4d53be29aac159cec9f/dukilefexuvukajep.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/80236506585.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/zerijibepikok.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/80210463705.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dk3ir92r775g7nq6tgkai7tuj3/pajupurejutirisidelagere.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/8782404319.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbca1d88c7---16389360665.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/sinuz.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vasikalurom.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca81fc3dc4---94248519211.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fafd535483---zovaxedawo.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/rojipogilupelig.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16116519e0ee45---32371928143.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/71231173879.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/oidtjt8idq6dd5ghqh9q5d3uac/18702788981.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/selagalepodiniwekavi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161255107ccb8c---22944054972.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/goxezipuvim.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/12732946830.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/fesexasezademaguvokamepem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=herbario+medicinal+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 20704 bytes
SHA-256: 9e51414b99b659119bcf3a86c330b33ca09aee470e50573a201c10707f9185d0
font_01_sfnt_off000149e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161FB 10648 bytes
SHA-256: c7fba8d349eff0f519b9b3ba984ad318fa94fb1a14209c897098b591080c32e3

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