Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72c78d6a907561c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-24 14:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eee7f26e5caa374bd698f2a31350a317 SHA-1: 705687788f79413cd7c9680b411eafe928dceb1b SHA-256: a72c78d6a907561c04867669ed971ec1bcbecdff5078960d8bcd1be2420b65c2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=best+app+for+dual+space PDF link annotation
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/raxisuk.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/zutopamibatejuvotifufo.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/jimozemojibajufeler.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/nifaweridokovajeve.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6f65d3d1db8462c2ecb626333b26c1ad/99710234995.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/56642453747.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/2751575873.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/somuzazew.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/xebojez.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/67128947006.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/bunuwibejolaxexavisada.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/50201782427.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/zapofedotowerijodapomivit.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/91bbad46c44c11b3f3a3a19cc5027a7c/5050070723.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b039589ed---45757565511.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133538223cbe---feteminukuwuzinolagadul.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/dokeziwuvozoxo.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614022c2d65eb---vigiberubagidepawivisi.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/797655121.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f32a28c47a---11310119056.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/1692202180.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109240818493943.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/57363832346.pdfIn PDF document text
    • http://sakra.sk/storage/file/fenesavisidumarunapenim.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/59253153170.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_off0000bd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1D 19792 bytes
SHA-256: 4671941cfd327e8676e39f036a871489c57901d62bc977bd363e044a0c876675
font_01_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 10568 bytes
SHA-256: 6db7a12d85413b922b66e3e8bff7bfe0b82d84e3b786fe9d19a47d5f76827e16