Malicious PDF — malware analysis report

Static analysis result for SHA-256 62be05fa5093e89a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 22:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 763377cfa0ea5c6b56b58d786d38132e SHA-1: 106d8c4f4ffcb52354ff0a9dc82a933b7484bb2a SHA-256: 62be05fa5093e89ab555e6824836f2f96cbef5c501026e42251f2652bd3d4ae1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tnslib.su/userfiles/files/rateranegalutededaji.pdf In PDF document text
    • http://umartravel.com/files/nojepixu.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/28719563983.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/81128662928.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/medotikelixufis.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/23871206967.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/rawasumugo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136585d48f57---27439423344.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135dbb5b1a09---45246473575.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/suvixoraxere.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/jitaxoxibeb.pdfIn PDF document text
    • http://oris-am.com/editor_up/wejekoredujosogisepuji.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c092e4075c69361bf05a4fd1e74428e0/rijuzadabedifudof.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/zerakuxoj.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/werubodiwugukipapuzo.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/jepipeve.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/29735564474.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/60970329380.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/68569797747.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/narexojiwejomosu.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/64583634837.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135883c43f46---51961932556.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/rejuvonarolexesuzatedumur.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/lomolakawizerazew.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/godisomomatamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=past+unreal+conditionals+exercises+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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 16324 bytes
SHA-256: 4626f6f2df4a1f0f5094453aac12e69cee1b318162412a1d485712b824a4cc0d
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 10816 bytes
SHA-256: 0d51101f7196f399e508b5810ebc415f76d66fc15ef7e33bd8a6ad5614ed11f7

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