Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bf1d62f42f3c77…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 11:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc101a80602a67887b74ddbf19c8f7a6 SHA-1: 82e1faeeb563e574615411f9782020e3c646469d SHA-256: 76bf1d62f42f3c77ecfeabb7d3dc679f591986bd47c631cc331203eb1b713f4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The embedded URLs, such as http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c645d25ad3---43603437873.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://cuatudongsaigon.net/uploads/files/36478894800.pdf In PDF document text
    • http://akinmedikal.com/uploads/file/tewuvesixojosi.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/gazibixagopedoxalavaruz.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c645d25ad3---43603437873.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/92899711845.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/vonozomisulasedebidoxox.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/533626437.pdfIn PDF document text
    • http://learningkey.org/userfiles/xuzegevisamaboledixomir.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-31/210831151435657277b403ggr1aui2.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/688d76f500e645ecbec90b98beb279d2/46894353066.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084414de8926---nabitodivazupowi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161341e6da0729---32513628642.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/vepifomumomazikegin.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/26130298594.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/12694543931.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607283c70c415---48603722558.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/76379458750.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/dupivotagedek.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/42527465244.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c4d018e0400d6d60ae4dd40a795f657c/20265945495.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e99a1695d---rirenojogokaxokigege.pdfIn PDF document text
    • http://szpk.hu/_user/file/74547541776.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/la81pt64o1gb01jaufkicgnfh3/gijuwid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=oa+phonics+worksheets+printablesPDF 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_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 18704 bytes
SHA-256: 30c3ffe3922bdfd60e03b8b234128de47036a99c494c515d20752215e96064e4
font_01_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 10816 bytes
SHA-256: c77346c0a1dcbf7462ee5a7ecdf1c7fe63f2cdc03d2bc0fc59b9cee5b475bae3

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