Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a563efe738f17b3…

MALICIOUS

PDF

95.7 KB Created: 2021-09-21 01:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 050f1df5774ecffcfbfe5e208042f24d SHA-1: 6cf3fc650106716670ff31a576103e394cdda76b SHA-256: 7a563efe738f17b38c0169c405797a0bd41003f6872e47bd64b91849142220fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with numerous external URLs pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://synerhu.ru/uplcv?utm_term=angry+birds+star+wars+ii+mod PDF link annotation
    • http://aucoindeshalles.fr/menu/file/rulojaduxuxitevuxun.pdfIn PDF document text
    • http://juentai.com/userfiles/files/dipivejiworir.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4fd439a00---36652728007.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/88187339909.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/xawaxegimom.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/sezafodekikaku.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/3964560433.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/levuzapawafixijad.pdfIn PDF document text
    • http://baove24h.info/upload/files/rovixapopas.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/papez.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/39426336572.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1aadfdb7---12700844487.pdfIn PDF document text
    • http://actinq.nl/upload/file/52471341049.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614636e39a10b---16758372959.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///tevorudiwejuwinugub.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/60355656415.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/56927946177.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614804d05ebc0---fageliseraza.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16149070a91202---wugavijawikofunil.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c76daff2---zuwuw.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/tolenibinudi.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/lozanuzolo.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/wotilekozalu.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/wukafadunefizenot.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/91819898513ebaef28de07e3c19ea8ed/niwet.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/modape.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_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 10736 bytes
SHA-256: 19612a49984c8e4dbc0dffcec16642cbe627cc1c559fac28b16df8a6e5169e7f
font_01_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13891 21020 bytes
SHA-256: 25c9105dcfefa9c9780ea5c1a7aa083084e6005f9da7443fa71fd680c734ff92

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