Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e000caa82086c7…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 00:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c08ee374457976db5291ccc1257b9b17 SHA-1: a76d921255a58ac16e5c0d7602260c4660c41c54 SHA-256: b8e000caa82086c7de3a63fdc8ef17238ca44002a8a7e5ec03ad7e7f3f662b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL patterns are sufficient to infer the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=penunggang+agama+full+movie PDF link annotation
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c51660a27---93550928221.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/xiduguzinerimow.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/rixutisoxajuzutubekujegud.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210913211748.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zumemiwisededotagojilil.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/29850654170.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/vupamatamekidasoputiv.pdfIn PDF document text
    • http://tfforming.ru/d/files/duvoxabudedowalov.pdfIn PDF document text
    • https://webaprint.be/img/file/gubilavoranepel.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/lebaw.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/kewupujub.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/74061672450.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/2486819274.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f781ad4a2d---fodagaziguxur.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bb727fdf---wixipugireluz.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210901_C32A720D420C8A3F.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/levalaxajefo.pdfIn PDF document text
    • https://sim2007.com/files/banobuxad.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/57519113579.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/malaxajumitojutaf.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/xudivemimejijetawogizi.pdfIn PDF document text
    • http://superazs.ru/images/news/file/50156755929.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/20230843165.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_off0000bddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDD 10360 bytes
SHA-256: 4deb4e410c804159195ee0d6578a2dbabe45598ef92379c08539bc1811cf48f3
font_01_sfnt_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 17156 bytes
SHA-256: f917dca5870c5dc2771ce1fbfd1b0751a150531b31790ccfc1d54adb8df72749
font_02_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1