Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a095cd0d8cff0b6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 15:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38d3e82abbcff363593645431e6616b6 SHA-1: 6d49236ec95e98bebc03b2a1a580dadef8f3c71f SHA-256: 2a095cd0d8cff0b65f61e9228c572e9a6bc97104436dbc5a777825d94efdee8e
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, and contains embedded JavaScript. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into revealing sensitive recovery information. The embedded JavaScript and numerous external links, including those pointing to compromised CMS uploads, suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://garglob.ru/uplcv?utm_term=android+self+test+code PDF link annotation
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08734ec2a---54523048954.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139efc9426a1---52493972482.pdfIn PDF document text
    • http://mopron.ru/upload/files/fopitofexid.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/buguwiwasepa.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109071035263833.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99b5097ce---nukuzeluwotafaxamofub.pdfIn PDF document text
    • http://okvin.org/userfiles/file/nogutemakolibubiga.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/fepuzidogowegevewira.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/fufokijerefonojakuwoxixu.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/wepevitamu.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/pogijarasogigesoji.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/78628467978.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/vanafawodupalelawudabax.pdfIn PDF document text
    • https://loctra.net/userfiles/file/74391798816.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/pafumefenozagogavakep.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210913085959.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/21690595802.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/limugekiwifapikatisumi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/36b526ce368873176d718839eef19bed/nupatutidufelawujobu.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/84610053805.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141095c8e02e---7274894491.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109190251003776.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/45267711363.pdfIn PDF document text
    • 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_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 17280 bytes
SHA-256: c225cd13d6496946dc4ea2806ede766273198e9b9445ec706737b9c4fa49250e
font_01_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 10288 bytes
SHA-256: 0c82519c4dfd80376d7a7b3a516ad071f4fc654f89ee8ee0cfbcdde9cbf4b526
font_02_sfnt_off00011f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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