Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fcf2407ac1652a…

MALICIOUS

PDF

89.7 KB Created: 2021-08-11 13:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7fd62cb73e065b2c97e5da0569dbbda SHA-1: 6f179c48901b9259ba948a818e384e5082efdaa5 SHA-256: a3fcf2407ac1652a14cfca7e395980c34373268c28cf9c7ef8c2998bb0e72a06
176 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm indicates an attempt to lead the user to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/76039954959.pdf In PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e37032d9871---vepulozi.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/9257e34a423135250b7f4e1b4ef499b2/vowapapajepetaxudifewagiv.pdfIn PDF document text
    • http://vce34.ru/attachments/file/31152236359.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c62b5a42d16a166880491d2ea145f77a/kinupusufapurafujipulinu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ghvo74hct4pd8s8h0sic336ogr/8896042705.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/medezizofevofez.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b185ba2b668---87685379910.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/46159863896.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607623db9e57b---61750986121.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/357474624.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608062c4169d8---suwifowipeme.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082dafb11d90---73632605117.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813aa759a41---84626533385.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082faee2aa92---88694204678.pdfIn PDF document text
    • http://birdviewjoey.com/webroot/uploads/files/96398045986.pdfIn PDF document text
    • http://nuestrasenoranm.org/clients/8/88/88a18899c67a61641ca1f7d027daa919/File/65821918157.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/93841717273285e222c77b9c444d058d/12735494533.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/621035558.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/busewobufowovo.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/38b586cd0ad1e77c0cb5777ed2290ac6/nezoribeba.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/54048334b2c706bc15dd22fd9633cff7/14648937579.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b638d2a57---pilewinugibonagav.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/9df3cf3d364cda9515b2603f9cdae384/lumalibonozemedeset.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/kubofejopegamovopifop.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16078d17cf3fa4---70401927640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+install+nest+hello+with+power+adapterPDF 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_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 10568 bytes
SHA-256: 2b7a59962508d3557ccc21de7249294db5139a7419ccc033f2e84d1c45aabebf
font_01_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 16760 bytes
SHA-256: e2ec0ae447499b5e2067ee50d2d8a93fe51f761fb54fb685bcabb36025ddbdd7
font_02_sfnt_off00013fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.