Malicious PDF — malware analysis report

Static analysis result for SHA-256 85100b0dfcb880ca…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 10:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 688d5f42fac1ce93a3c8f0247358b637 SHA-1: 4c7e02458678112e5852eb532c00780872451bd3 SHA-256: 85100b0dfcb880caffe5da0c1f9df9c2872d03cd77295ef321d10370e1abd0bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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.
  • 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://cructi.ru/uplcv?utm_term=hardware+maintenance+manual+lenovo+p52 PDF link annotation
    • https://ecotranslation.ca/upload/editor/file/fububupo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611567446dc6f---55376896139.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872bd8c48e8---xazavutafonasu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/33db03ce2cfc294b589df67da75f81ea/21555185912.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/61199446935.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6db325398---97938857904.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bc07921fe---rawejikorofojulapaxu.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/68578051512.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/zopitasasapugaximubalop.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7770ae55a8---46115654089.pdfIn PDF document text
    • http://belean.pl/userfiles/file/49509551655.pdfIn PDF document text
    • https://marijina-romarska-pot.si/userfiles/file/49294130500.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/10cdbcc9471fbc7abda68dc23a40adba/zademudizokezi.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/22577300353.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3f32fo8ko80deu2o5tfhe9vb2e/nedosorukilemejigole.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/fovuvutipa.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a178af52907379160abd7ab413be688d/92291096079.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fe7f93ae29c1cf6d5e98fbd187b23de5/bovivikokefumimasesubibad.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bb8dfaa6f1a7329cf6d9c5d565c40732/72098290188.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/juduwofulojururaratel.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/k80s33iui1gj493etk77uhg877/sixid.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/tisuvixirami.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1624161037.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021071310210773499.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A1 11004 bytes
SHA-256: dd1f84699de5c9e112a95a13f13f33bcb501d58d434022a4927fb71e3ec5f95b
font_01_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 23324 bytes
SHA-256: 9ce256fc718e8174b3d09fa78e46bbaeb04c20ff45f36106c02684cf2e738b31
font_02_sfnt_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 16460 bytes
SHA-256: fdd3ca52ff999963d330a7fa03801e4ea150d28d716902adc164706ad720db99
font_03_sfnt_off0001335a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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