Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdf7fffe23efcde…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 16:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c6b9a63ae48989a25da2ae7009c6c90 SHA-1: a1e43ddb6af40ab53ca0bce3c007ef1cb7bc33c3 SHA-256: bfdf7fffe23efcde869bad2523eac83567f46ac026d0a34e8ae10bfe1b0750f5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or potentially malicious domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://magnachip.cn/userfiles/file/20210523214808.pdf In PDF document text
    • http://conelser.hu/fck_uploads/file/dafefanelamafu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ef6fae5bdb448558bd3ce53d60b1ab0e/luzigiv.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/sisezoxuvavokedar.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/90441735888.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddff187bdc---62589151296.pdfIn PDF document text
    • https://promise-land.com/upload/file/mavafekitagufuzosiveli.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/radepovomubaxelol.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/fixapajal.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d8373db9912ba9ab0f1da58c93fd9246/84940775665.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021050821521373499.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b3ce14d3d---18963655381.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9252c3798e---57293359484.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/wavoguriv.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/87474436360.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/dabejibogijez.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a089352a0934063989bee0df594955d1/61329649957.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/moxas.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/xurakoxinilizomulo.pdfIn PDF document text
    • https://davaocarrental.com/images/file/pemepowegujujutazesem.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/58052317024.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b9469bb3085---tagoxukevenuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=inventions+and+inventors+quiz+pdfPDF 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_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 17268 bytes
SHA-256: edc9c6f2b06c215773eb997df41e2dd0a219006c4444ff40be82ec675c5b2699
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 10768 bytes
SHA-256: bce39deae457143ec0ba0612f7e9b09d9dc232fe632d2c7535c5086beda37827

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