Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b78fa8025629f6…

MALICIOUS

PDF

74.1 KB Created: 2021-09-11 12:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d8fd05df1a74b7ea5144577f9edbaa7 SHA-1: 2ad9e785aa11bcc3e6ec5728ce17ea37cafa0c8f SHA-256: 42b78fa8025629f633e980af264adc36aeb332b6ec764672daa963db4f8727bc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some pointing to compromised WordPress upload storage and disposable hosting, suggesting it's part of a phishing or scam campaign. The heuristic 'SE_CALLBACK_LURE' indicates the document prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cppzone.ru/users/blogs/file/losufipukonubaxewabap.pdf In PDF document text
    • http://ok-poland.com/userfiles/file/kejivilitaxutomasodujij.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/wigodavobijurevezitino.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/66067774162.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/tamigegewusogafujiwewos.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/43798389451.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/96327345024.pdfIn PDF document text
    • http://4rrecycle.com/files/file/76025367844.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb01605bfd---togaduro.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gubuv.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/winiduwag.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/4010726067.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138461d48478---vovanepofi.pdfIn PDF document text
    • https://togeltop.net/contents/files/5125357151.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/jifopexara.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/davarizoki.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/51357250093.pdfIn PDF document text
    • https://securitydm.com/slicice/file/25803665216.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/6930040822.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e42d9080103d3c41383ebb8f2e59e406/kuxoveliruduzejapekubo.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/71102826707.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/28369936934.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/39890209699.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/88138503153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+great+gatsby+pdf+downloadPDF 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_off0000bf05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF05 10988 bytes
SHA-256: f01b37f4942048cebebe71b39aa9bdec8341dc04d2eb23b774977e7e599be5e3
font_01_sfnt_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 16616 bytes
SHA-256: fc6f24eae6a95c19ade9c34801dc1ff931d78a3f1ac9fa03f65532415ab4f43c
font_02_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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