Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf1ded0fc3b1a88…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 09:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb853581f86a889513c77cf5ebf56df2 SHA-1: 650747b40bf5ed58b8b47b4b0e548bf34545db8c SHA-256: 4bf1ded0fc3b1a886ec2de2888c26ef1fa529ad5b4d2932839e8d3c790e12ce7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating it's designed to redirect users to other sites. Several of these URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification further support its malicious nature.

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 http://handbook.hu/upload/page/file/30528354706.pdf In PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/27583506773.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610bf7d3c157e---45078925111.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d0fadc61e---sejejopowigajop.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/39efb366f948d7435ff5e871b271a790/86721563227.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/89a73f43e311ee107e3f06bce37926de/2459586886.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/29893491671.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feaa3e17ac---medelaj.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v2kk5ld0oil1578dl0qqrkni75/92362976711.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a093113f---1826359485.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/13d434882299a09e0d0d65cf18e54bad/73522523040.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/r2cmmcs4v36akvo9bb84gj75k7/xuluwanun.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623482567.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/1697934258612d03108a87e.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/cf5lv3u73n6d0q659ls5uphuch/54851567303.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3ef558d1---jubeworapisu.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6i9me62si52fdfs3v0di919qfr/85841845348.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/dupiwobegatuza.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe63d0bddc2---vuzilenanabixafaf.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/47kqsvndkek6m0ugc091l4asa5/94576254426.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30206b44d---tebudanudefa.pdfIn PDF document text
    • http://cloverdiamond.com/file/dugizikepewefix.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7de4d36cb598134ef1a926e73fbff838/botizidulagixekuxudow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=canudos+euclides+da+cunha+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 10652 bytes
SHA-256: bd9996f31bd73ffc26b55f63b9bf7c8f5179c359413555164e3db1baddff43b0
font_01_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 19016 bytes
SHA-256: 0ba2627fcf7ad206de84e22820ac28706eda7eac2d7b2e437f0df788f0cb6365
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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