Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dd8c92c9ed5228…

MALICIOUS

PDF

122.8 KB Created: 2021-09-06 22:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ba68e567175e2bb0b5abe8ee6ec6c8b3 SHA-1: d66e5a48c6065a0c7ffa99facdd422ca245540e0 SHA-256: b1dd8c92c9ed5228601212bd3534d03ac4de438c72546906a5c5c1cb08ad0e89
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b06751e33a5---kipilegu.pdf In PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/50204210776.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2cbe64a99---sebojovape.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5a0aa330da18cce7c09de9c6cb595b4a/wuduxiw.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/mudowasoluki.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cfc5811b5---wojulakor.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/95733337027.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/tibijazer.pdfIn PDF document text
    • http://dothi.info/images/files/56466443876.pdfIn PDF document text
    • http://sdds.be/userfiles/file/fediwatikoki.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gapuje.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/kovipabazujexogavetuko.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608341e6bca66---xegefejasunanonuba.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/63790978583.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/62483378595.pdfIn PDF document text
    • http://jljemc.com/upload/files/97148360450.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/14502257571.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/21268146335.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/64857892376.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/9357114918.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/60496714179.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/xuzorogewepesujibawewago.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/fejoje.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/17b077841c34191b83eee208d3cde3f2/bilanomafomuwegonegoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=grimmer+schmidt+125+manualPDF 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_off000174a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB3 20856 bytes
SHA-256: 9ac6c9886f86854cd21454863dbef60c364d16af3d52d710e87e3d744b126109
font_02_sfnt_off0001c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C422 10960 bytes
SHA-256: d555f0bd4ff104197b4a62b8615168816a6f2d125d025fdfccba0a30a7905f69

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