Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59232050914c44f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 23:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9dbbf6bb5a5c138607158fc3bfaabe0d SHA-1: ae4b774f8ce919a60bb135c2b6835ed443c7c86f SHA-256: e59232050914c44fcc4366dc4e6052239cabb9cbe988d3bf4ef78977f76bd4ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this. Although no scripts were explicitly extracted, the nature of the URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=acr+guidelines+rheumatoid+arthritis+pdf PDF link annotation
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9k1edvl2a98dtsj480dc02urvs/witelu.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/gubizejajepefaliker.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/5593669390.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/79789408248.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/28764985950.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f19c90caa51---47875875856.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/33537796731.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/lorujodugupisexifuferad.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc9f0a697d---56980466231.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/76792283777.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad7e946d5---46078353254.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feca901d05---bibozopunobos.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/bavininizakasinuwaw.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/96685598862.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/sowem.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607288630a6aa---2178508914.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/wekisawev.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/wuxexiwupuzulexo.pdfIn PDF document text
    • https://kuepancong.com/contents//files/lamaberemof.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608479078e33f---kawuripozofamoxiz.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ql886uj2k093qkm4tk67jgg22j/89067536019.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/29809817548.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/figiwojaratokodon.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d61a5850c91c43fbe824db5fac156087/59908187815.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607018ceb9e14---zobezajotifokivedowafixez.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_off0000bc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 11148 bytes
SHA-256: 7a518b577bdd503b2d98510bf8472f90dbad69667a8f73529d0bfb3734b04edc
font_02_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 16076 bytes
SHA-256: afb2eb80806f20fb7f94e38e1f1ceb113cee8e1574e0cfdb7bcedb9534f686ad

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