Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a277a6b099ac592…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 12:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6b5cbfb33c1502beb5bd7d291d24e76c SHA-1: 8fb993a075c798443761090134106621a6424cdb SHA-256: 9a277a6b099ac5928dcc19f92f44f0a12925e7d88d9ee9dbb142ae0b7c85f75e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://powermailer.in/userfiles/file/lewotadixipijudasidi.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd60e30ef1---54991630401.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f198e33d3c---timujexodavejemoko.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9a43e1cd6---86868226348.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/58634197131.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/s0rbighdgcqcmiehubnnmp453i/84973478834.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0ee39bcebd7f462fa0c1caa716e7b4a0/rizoturidokexanifubobu.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/lokiwu.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/reduxobunav.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/7915154189.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/vililitosavabowuduzov.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/8715759744.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/xerebidegade.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/e34b9kqbtnrm9pnpdo6tg71o54/guvonujidifumijuwagup.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/31328054689.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/jaxukelepisazu.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/dukifizi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82745b535---52285871348.pdfIn PDF document text
    • https://triosms.com/userfiles/file/30835362002.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sakalazubinutibexeraveg.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/kokimomoxojerazom.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a90bbb3ce0f0c49e5c45ec1038f35fcb/revoribepozo.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/ditalegijazaxaxefeleze.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994b72051ab---zikevas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bohemian+rhapsody+partitura+coral+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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 20040 bytes
SHA-256: fd7c45fd060b589187b5aa0695cf8d253cec99340514418e7f5b1a71b0d9c2b6
font_02_sfnt_off00013623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13623 11152 bytes
SHA-256: fff6a25bad1ea24fa5a4ca3243a2355c7570729de8b431ccd2fc4dc5c7bb7a40

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