Malicious PDF — malware analysis report

Static analysis result for SHA-256 3969bda6123e6310…

MALICIOUS

PDF

82.3 KB Created: 2021-08-11 18:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3adc6fd39829257df440a78a64c04560 SHA-1: ba861c95de6347374d3630b64abc45f4c8e9d587 SHA-256: 3969bda6123e6310018e0a08a1def00908137870e3d7bee9cef258cff055aafb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to lead users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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=sansui+crt+tv+service+manual+pdf PDF link annotation
    • http://josephlillianmorrisfamily.com/clients/59960/File/35850060389.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/83974736945.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/260281269.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/75033432424.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/3254180302.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89274214b8---70129173723.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc94388217---zeneraditutanasukux.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/676391d90ffa10c9b2d2422b60e4e6e0/34064489512.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160981ff6598b7---pezafonegezorewa.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/9001536214.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607412ffeab81---wolosofunikoluxesadizul.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00ffad58e---lulevunabi.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5c46c32795ced350fdf52d5e0f3892da/14863033154.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/lutebejolukad.pdfIn PDF document text
    • https://bonacorsi.it/file/lazizinukenujonemerom.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/xejukitawesifeletub.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/debq3vu4j3elk8ugkct7bgqtue/tutenasoxiwef.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/jimatipuvesezikofuwonul.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/zizusavuzafanozosisaduzal.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210611185914.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/73icrgfr5lv786v2rel3rguuc7/gagobukozekoxized.pdfIn PDF document text
    • http://merwepizza.com/upload/file/10520003483.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5d10fc04---nuzavexavijo.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/0ef5fdf8332ba8fc6f22679ee2a220a4/vabutisi.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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 10904 bytes
SHA-256: 3fb2d936c27d94526f5053a40fca12ab073f6e4559b7ebccacdc6d6908035fcc
font_01_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 17092 bytes
SHA-256: 0a700a614e79df89bc5b7a24a1780ca8110ff2edf831b4deb74e25381f89e952
font_02_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1