Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3afced9defea20…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 18:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b596b74c6955307af29cc388ba03d8ec SHA-1: 81450d97c34a0041b730141f90995b0ef0dbb8e7 SHA-256: 5c3afced9defea207f46b924eb71e8d3afc3041d0637e189ea311a737c6a2118
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_INVOICE_LURE' heuristic further indicates a social engineering tactic to trick the user into interacting with the malicious links. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=cambiar+id+de+llamada+android PDF link annotation
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/65079778509.pdfIn PDF document text
    • http://mgrima.com/files/file/nodatugoxulariposoporen.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/35368196297.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344dccc79b1---41867157938.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/91044108423.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/45809447609.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/54343635376.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/mubux.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/fapojenumobul.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/77036743927.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/dikiz.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/dufap.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/doxebafugobotilokulamubov.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/48620472753.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8caa059f---sivopifika.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/81306690417.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/56590525582.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/45338987743.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/rubopimemujowek.pdfIn PDF document text
    • http://abwessex.com/uploads/files/romalukif.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/xibirazivifarukinamujade.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/86458062688.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/96670628978.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134769f4eaeb---sirab.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_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 19088 bytes
SHA-256: 56304104790e89c90606f4c04085b007412a00aa6a405a2673c8cab1fc0b9144
font_02_sfnt_off000135c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C9 10312 bytes
SHA-256: 33ebb1fe5cd6b9f9b16926f5f92d52ff7b7a5c38bb0f99b59aece312bdda87fd

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