Malicious PDF — malware analysis report

Static analysis result for SHA-256 277595748146fd78…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 21:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19d8a6cc664b033a70c5bdca9f558c74 SHA-1: b3606bc173ff4ad9e01ab852b5200a321799a9cc SHA-256: 277595748146fd781fecd1ee9c816867d671b888a91398c6d01172728f8f5839
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/77367174174.pdf In PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/30840184416.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/dajuzevogelini.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/73525006998.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/lijugoganeter.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/31235326133.pdfIn PDF document text
    • http://cudicio.it/images/file/zusojuvejulixusotaxetap.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/65230509535.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/13904681002.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/21786078845.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/59639681449.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/pufuworajetilalulofoxej.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/palibegiwetaleludonipu.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/71037104418.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/57315098717.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc65194eb---zufetegus.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9adbaf1c557b4a58b6af4e920fc3becd/39714463985.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b9b679d85d24dcaeb88dfe2800d5437a/gezabop.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/govikoxijamikekajeledub.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/16635632858.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/10734271469.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1ada0c843ac8ee89b0b2f5a7cf1d3bdf/kilimewanetodid.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/monuxibilo.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mevotijofosarolifikinexo.pdfIn PDF document text
    • http://cutskytools.com/d/files/tidepaxa.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/16471980229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+mirror+android+to+monitorPDF 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_off0000d3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 10140 bytes
SHA-256: 5a06902d5b988d56bcb5d0fc084951590491e6220bdfc74df48d15434a3d08cb
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 18060 bytes
SHA-256: 502c601bd897723c413410ffb3691348eca65ef75b26df07d0f99f721e687e20
font_02_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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