Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7c43b6698b964a…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 04:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 35e21dc835df4650a9aa87cdedbc9a5b SHA-1: 49e00f55fd9222c62cf4c9b3a53b70ad2d2611a1 SHA-256: 8c7c43b6698b964a413abb371baa99e4107819549c946a4231ffeb0b0f987683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lead victims to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous URLs strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://drafthe.ru/uplcv?utm_term=turn+out+meaning PDF link annotation
    • http://bonfiremadigan.com/uploads/fckeditor/file/vakusoluximoxuxutututuju.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/xupofikubikukifolus.pdfIn PDF document text
    • https://ka-base.no/images_content/file/43343375098.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527233730.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210510184543303981830.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/61715977244.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/vn9g37oosaflm7k0m4o0lebjmc/12637552284.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/afab8f864b0ffbf40209f55f95222087/wazibam.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/46933732432.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xufemefisadokavu.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/42130338877.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f3fc0cff46fc81b9365613f9861a2be0/47578705989.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3u53ndb5lmpgb33mgvq1o31c5c/dewujutituzu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d40ba72ac54---befagujiso.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/93b7226da406f00bd423d17ca6192838/54573680758.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/57773636541.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781c4ac3a89---gonukozukoreninas.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/tizevilujamezixule.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f47edc66e---88002245868.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hucqn6632nlkdmqu43m1k8e0pp/96161152690.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3708ef7bc58a64da6a681853911c2d08/22668679553.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5233dc21---90221209107.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 16120 bytes
SHA-256: fc96bb51e68212267b34b5acefce01e3ce1e469c7be8c0a453211fcdfa4f682a
font_02_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 10300 bytes
SHA-256: 51585caf54cba03c0dcba5c944001ef93ab0668dd79cd2085945db4cbfd8c932
font_03_sfnt_off00012327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12327 18468 bytes
SHA-256: d9da0058dec197f439b628888575f2ffa3d7649bea75f7a5175328f005675b87

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