Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86e530e0cdad215…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 06:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59ac5e02fbce4d76cd9a9f245c7dde24 SHA-1: d01a4ef5fef27fb06eb725ebc81a19d749e035dd SHA-256: e86e530e0cdad215d3daeb1f37b357b7d8d1eefffadc39351ccb0a285e0cf6be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs that form a link farm, directing users to potentially compromised websites. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule indicate a deliberate attempt to obscure malicious destinations through a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=eppendorf+5415c+microcentrifuge+manual PDF link annotation
    • http://portableandcool.com/files/files/19545013787.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/85167418460.pdfIn PDF document text
    • http://hotechike.com/files/files/dupomowebenek.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bee808b5bd5---89387911052.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210525151027.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f0bd96sb5v9nqvv9sb77jjsur3/tazijevutelirajifenafur.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2091e9477440417b4a2edbfbee49f3b6/xomisukiwawugofusizapimi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6e88d3e93a3b7030c0aa912cce928acf/wabufojinaguworivi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a8fcac178---70630332561.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/16631119786.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qso2s26ddjls4gbonc55c7iq5v/doxufozu.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f2572bae5aa5444d1e58164ce4579f40/moxibuzazujeweruw.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/3685646059.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f6641d640---43078380074.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/168d4107ad0cfab4366cbb61ca34ee71/64595060145.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/56562039687.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c40629c9fdda0002261c1150c6fda357/10583980554.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9e20bf50ddda6dfc0faa197d9414a1c1/jurasaliduvozag.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/mifenujufananuxano.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2d1b65e832fc0faf99cf5298c9ad6c6f/vifizoba.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d0fa91dd8---mebuju.pdfIn PDF document text
    • http://apvn.info/userfiles/file/62939693712.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/24639621129.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/15099741032.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nakizi.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_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 11140 bytes
SHA-256: b8a954b486f6fb4c42ab800df835e6b20096f8b13b7a702c49c962c1b6087423
font_02_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 18524 bytes
SHA-256: f51f09e46ae55fad7877f105caaf4a5ec8657d6bb8d744dac144c07be4b42d46

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