Malicious PDF — malware analysis report

Static analysis result for SHA-256 244b3eb862187b33…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 05:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f850d0208451f9110dfd3e0114138348 SHA-1: cb5feb594aee324140d1b0863652e7d2be50e5b2 SHA-256: 244b3eb862187b33d2497c793355bb2251a70048d5bd0a37bece2785fcef4019
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b928971d2f---pugegajesa.pdf In PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vazumowuken.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/guwukipewutujebabomofivi.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/sijojikemosebopuvama.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/91919013874.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/11725656583.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1626351725.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ipsjh39cjppmjq81q6e004fqm/bodapibukef.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f884b03ad8---zekalekolajaxidosuwekem.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/zubarajigutujupaxam.pdfIn PDF document text
    • http://exima.kr/userData/board/file/gititugibadup.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63dfbc8055---96023570328.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/72208898999.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/10611836057.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cdcad0726---fuvumavebamifemawobow.pdfIn PDF document text
    • http://agro-partner.com/Image/files/57411235235.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/av2l6uif9ej75nvrccepjs2qkn/34107928805.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/jexizefinediwisalilekot.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/zexumixigagupisa.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/mtrpboodqj26tih31t0te0ab5a/budapikokina.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/buzewisegemunijalax.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/notamiwirigor.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/wulononifemudonugimaga.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/02dc4d7e502ff5158025cebfca6bcd99/33487717068.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c76c8c2b2---69908941713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=unarranged+marriage+bali+rai+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 17708 bytes
SHA-256: c85d480591d65ad1fbe679c032969be16f0b1fc0fba29e5795a6fa0af697c80d
font_01_sfnt_off00010f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A1 10600 bytes
SHA-256: fad7b358d0bbacc400c150f67a3b8576d761684969261618a694fa9c307d1faf

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