Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9cf5b86a801956…

MALICIOUS

PDF

78.2 KB Created: 2021-09-22 12:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7067cce78d12ac5e21326bf0d0f9d97e SHA-1: a85e3957f28fd4eac07f3dd5e95d05bd9180ef65 SHA-256: 4b9cf5b86a80195631a3c3d66022358a451a0c02d0453af5a8d037ef93c3cf13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=tektopia+minecraft+mod PDF link annotation
    • http://lenosada.sk/editor_uploads/files/25630932285.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/nikotodozegafazazi.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/89706518393.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613b093830a7e---11703358112.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/wugosupakuxijerutes.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/jipimipobawumod.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/dapijulewerak.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/bizidoloranorigagik.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/73302527982.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/68313134333.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1dcf94e95---63602076894.pdfIn PDF document text
    • http://badgerhillfarm.uk/regojo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bf3037cd---sojuzedepegeni.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/kufovamin.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/40872410111.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6753e863---kobekutikami.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/kijuwezor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56535694e---wukazupudogivuw.pdfIn PDF document text
    • http://portableandcool.com/files/files/tiwusolozuxugazopugus.pdfIn PDF document text
    • http://mfahk.com/upload/files/46488558759.pdfIn PDF document text
    • http://sdes.in/uploads/7220272211.pdfIn PDF document text
    • http://rrarental.org/upload/file/nomavireru.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/10106582276.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/xerijiradaxuputolegipef.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/riruwagukipunu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 17692 bytes
SHA-256: 79d1acdce1f3ded99789240e17e113d74c49a07894a6b888aead8818a86cb51b
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 10624 bytes
SHA-256: 4043b5666f6b6d8b27130ef7cbfe938a344db3a74727d0df09363d63d05376b6
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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