Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f698141e7acb60…

MALICIOUS

PDF

90.0 KB Created: 2021-07-13 15:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63938543412e483952c936c1f6367abe SHA-1: ad78bad699b3a42b11317223df872a34cb116b23 SHA-256: c7f698141e7acb60985772e5043832550836f4b2c937840919443cfac7b4db9e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains a phishing or trojan payload. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware. The 'SE_ENABLE_LURE' heuristic indicates the document instructs the user to enable macros or editing, a common tactic to bypass security measures and execute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://queure.ru/uplcv?utm_term=cryptic+picture+quiz+questions+and+answers PDF link annotation
    • http://whalesart.com/uploadfile/file///2021051823441080.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cf0b7ea16332738f2c82481b63455b65/vobizuzumezifatavofupiku.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3e0879b1323566e143caa6f347492970/zesozugurixaxufamat.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/xupudejo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865ba7a79c6---zitafipebujowomupema.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/69735702763.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e48eb6e9d4---xadofaso.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/nulatebakuzere.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8001ef7f86329f101465f6d191f0ea8c/89038842882.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/320736fc11517b868269fe7aa2aaf62b/bizaliridikutirogaxepizi.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac7328cd3---64277696366.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6ea8f4b43615e2c0fa2c97ba78b299e1/49347405647.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/62953448226.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ea33814f35238d35654d54a41fd3a31f/53436626790.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3156d7e55544253411b9f490d6e7ac02/79496299998.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e85b8239---vejiwiresifekaver.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/oh5rlfpai0itceuj2374r18b6a/segewumotilonoxebijim.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/dfeb229664c916faa8f3dff1c2a07abe/koderuropofokoj.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/499966be50ef03658d379b97812df791/suwifowufizininilozodewu.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/93840172173.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/wuriraregogotuxedufaf.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/nufukof.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7deb784ed---97471828750.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a03ad0e8d70---80379344290.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949617591ae---nulezajizog.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_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 10996 bytes
SHA-256: e32d7651b55f1ed64e76fc64b069969083f8f5c1c5fb795f0fef3604cdd62224
font_02_sfnt_off00012d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D21 17304 bytes
SHA-256: 633743650dc096bac0a3e46adc7beac0bd85a502793a09ad8bdbb403a358698a

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