Malicious PDF — malware analysis report

Static analysis result for SHA-256 62399100a75b91af…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 06:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 14387da1ed6e5ab8caa98084c66ac1df SHA-1: 36fd326f47f281c6e3945882c888f0c5b1e3a0fd SHA-256: 62399100a75b91af5cd87b764eb74d786da7029eb70b1b59f49f90719be0ed7f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://granitnet.hu/editor_up/92806505590.pdf In PDF document text
    • https://argumentua.com/i/file/zurujupuvasevowi.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108071304492089.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/40898020222.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210826/0600309449.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/zuvifawegusuvikuxusipa.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d57e22685f---28570851762.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/68gbs1hbvia3sca43de5okbpct/16337608120.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/puseburube.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802adc9c1e0---8105152930.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/jurog.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ce80e340fea2d2d8a8779f2ee75d44bf/85856305103.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/81512949812.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210716_E0BEE44ADD8248A4.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/75796772744.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0f7f7c7d290a0cdc2d32017b8cdafc5a/josividizitimajifav.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/nilupo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f457e4d0ca---57023725285.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/50688747239.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4rh8q94l10q52mav9dqnndogu0/30779694039.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa304886ca0---tabamupigijowebu.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/lununuzopadubova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=knot+in+my+back+near+shoulder+bladePDF 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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 16408 bytes
SHA-256: 835e6b00b7a5aaf35c43be08eb4e56e8f2743bbc53b9ad598e7d0f4f6cbd6d57
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 11072 bytes
SHA-256: 3ebacf4777654823843ec8eddf7ad8f239d2418a74b414d592762887542b0291
font_02_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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