Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7ea6ef3d25aca8…

MALICIOUS

PDF

98.3 KB Created: 2021-09-17 03:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2824783d83d6614f55d2db8b8ac187b SHA-1: 80231de705a65fe8b6e405d6a045d8d6ba5a576b SHA-256: 4e7ea6ef3d25aca8fe46918bf88a31493a172e4d9dfad60dea4f4a7cd011323d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, some hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=lights+out+full+movie+download PDF link annotation
    • http://crocepadrekolbe.it/userfiles/files/jevasebujalilejegowas.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d24050de0---91635778650.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/kopejiziluxisesogogi.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902215349.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/babedu.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/saxazasiwaj.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86182960386.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/267b5f3b9da37441d994d38da4dac960/wuwalunanevoveguwuvigede.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/80662811757.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/299e369242c874abc45048f83690efc8/nadojotelavolod.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613068865d461---zavivokirawireruli.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/sotetedogiguxekukaxoko.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631802209.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/23373424104.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/fokekonuparuxu.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/86225918346.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/4405358537.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/83057450198.pdfIn PDF document text
    • https://iword.de/userfiles/file/87929594041.pdfIn PDF document text
    • http://ebus.cn/up_file/file/23013575352.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rt6lgkigq6lui7hk1607n93fhl/86918914804.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/wekifagekudowubafumelix.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/jusudibovog.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/1092517244.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/gexoratulogodu.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_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 10908 bytes
SHA-256: f8d72eb3e2176775f4d5b61f1cd02b63ea48652742b6e1fdbc11b75b3480f394
font_01_sfnt_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF9 17460 bytes
SHA-256: 8c18271aa62d5b978ba30135259c2f80483d06d2d9c67b9884f157ffee17a08b