Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47d841c11dbcbb2…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 04:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 270bf222d6cb64cfebd8163faeb0de55 SHA-1: a2b3e19d865f4d27dddfeccdb519e937359ae87b SHA-256: c47d841c11dbcbb2dbca14b2c49279558ae32a9724e874e3ecfb89895d9bc7c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8af1ef0843e6309ae3e7c543479d5b57/sazepesopabi.pdf In PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/oc00lj2j8nq815o54i6unnu47h/kokalivitizega.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/68296291853.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/karateduwo.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/32199933165.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/926f316799cd4bf6274e66531df741e3/xofaluxezexobo.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/gegozopakimeg.pdfIn PDF document text
    • http://metallpress.ru/files/48248558613.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119fc5e4688d---12123715776.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/letovomupidalamaxa.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/lotunodasejotanu.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/19041153338.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/jdrkhrkchuk5g3p84hfsaf6e66/sumutuzikuwozevu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/buekuj55le7dv6v0afqktahnfl/wijiwuxafewipu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/065bdcd042c5a4f3cfc4bdd9096c737e/kabexomasap.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ea07bddd1082cdf6af1d8e46576982d5/xexuwepojuz.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/33786571711.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/40005154098.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/56429432706.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/20599060240.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///zisopu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609851052f14b---serisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=toefl+pbt+structure+and+written+expression+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC475 11004 bytes
SHA-256: 167929f3ca538552e84f25c3873bf395adb7d35a3054f5ddb2d33817cbbe0e4c
font_01_sfnt_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 21352 bytes
SHA-256: 07e2c8faacdc785fffb2c3ccb907dbd85ff2a7445bb3e92c76af5716abe89c52
font_03_sfnt_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 16276 bytes
SHA-256: d00f1692df822d21e1a5e98ad8b77085329bebac9fa4d66ecc38022986c9330a

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