Malicious PDF — malware analysis report

Static analysis result for SHA-256 273777c2b77c8e11…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 02:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fca7c0e83ca37960fec2b6a10c9f1bea SHA-1: 1c9a9853612a39a67360bc83f54d11737927830e SHA-256: 273777c2b77c8e113cdb7e8acb3113d49e88997e74652ca5f5c6710e95c1e7a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. The primary attack pattern involves a link farm designed to exploit user interest in PDF tools.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://smidgel.ru/uplcv?utm_term=merging+pdf+files+in+adobe PDF link annotation
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085a6e085b2e---82067040042.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a27a68737f---92790076001.pdfIn PDF document text
    • https://carlojans.com/cms/file/87103628223.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/budatawagevov.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/42805371836.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/togetedajarurotik.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bf5db45f6---jepasorofugesene.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210820054734_ysl9gb.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/milebapurazulu.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/vibitojawifatukugo.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/75163346922.pdfIn PDF document text
    • https://masihpt1.com/contents//files/jipewunasitalozidujivuzu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893c0c686cf---mapekumatepif.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/37127c67d7356f819110d00886d2d873/tozadaravog.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/laditoposila.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be9f2286ae2---resevetafawado.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/wojiwuwowuxomisawi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a67a45c22---87361017898.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/88863301690.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/31524592135.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/75937401804.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/5546798028.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/53248613490.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6631fe50---35505464041.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_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 10708 bytes
SHA-256: c74c96e9c14c6b9501fa4b758a6dba6e17d15a7ff44a84cef0e9885ffa7c0734
font_02_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 18288 bytes
SHA-256: 33e59b12f147d432d2d6bcbe604dbf02b07994579896585e2bba90c3179e6cc0

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