Malicious PDF — malware analysis report

Static analysis result for SHA-256 3541ab175df6d653…

MALICIOUS

PDF

71.0 KB Created: 2021-09-16 19:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 801481a3158113115bc14450f77fcb77 SHA-1: a66365e9cada9e18578e69add45254aa1d95fbe8 SHA-256: 3541ab175df6d6537fcaa225e6a6f63f46eb5d02812cf9d9798e1bc038504414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing lures for software downloads. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=fall+guys+android+apk+download PDF link annotation
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210904115502.pdfIn PDF document text
    • http://hibertek.com/image/files/20210902_204452.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0777831bdd7030ae16991edc4c576ef3/97984549678.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/juzadabogobo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/tovuwedepetonikamun.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/nenef.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/71884439109.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/bizoxozoxa.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/pumizareli.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/96897084933.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210914034602_td7ny5.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/sipunebajafaruvotul.pdfIn PDF document text
    • https://suncables.co/images/file/rigat.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/83652916060.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/85727372894.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/3864179949.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/29f265125850db85a935d06814287efb/zelatabid.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/nonomofifimobijosajo.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/96300853583.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/letimivenuwuvi.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/zivunixop.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141638427c9c---gafupume.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/fubazigivegobogikixoluf.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wumufada.pdfIn PDF document text
    • http://pinxedien.net/upload/files/18086930438.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_off0000b572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB572 16148 bytes
SHA-256: 01aeeefbdf0de1cd261c265bea7447f8fba1951b7f80adcf9802c89ba18a5fd8
font_01_sfnt_off0000dde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 10704 bytes
SHA-256: 93f0c2ddb70a0be64ea04b3e4bdacbad5a05158015eec2b04bd2c30bea1cc632
font_02_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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