Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab51e5c07d30064…

MALICIOUS

PDF

90.5 KB Created: 2021-06-29 04:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ddc84cf18b3ef634313a92b234aab194 SHA-1: fc10127073f8f2b3d2cba0de89c0e4f19c2276e8 SHA-256: 2ab51e5c07d3006496e2f6a2707d405df680ba292fcc6b8dc27e10e4d55dd47a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV as a phishing trojan. The heuristics indicate it functions as a password-protected archive lure, likely intended to bypass gateway security by encrypting the actual payload. The document body is heavily obfuscated, but the presence of PDF link farm heuristics and numerous external URLs suggests an attempt to redirect the user to a malicious download. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bagliodeimille.it/userfiles/files/84537554994.pdf In PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/59919202168.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a947d2696d3---gimuloluke.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/bomenamupuperiburunof.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7q1mq6r9j3ojcabuvpnvhbu607/rededezubutadesarivi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcab86f1c0---gopaluxivikukedi.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56891aaf4---lanokirefijesukilegajewab.pdfIn PDF document text
    • http://carszana.com/image/upload/File/jisesufubikowu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43ecd935b---11249257019.pdfIn PDF document text
    • http://chikatere.com/Upload/files/92690454009.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/13181162891.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a543ec9dd6e---gibuxukidukiruposizetovu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/dutasegshjr3h04qn9v76deqe5/rufisogixirivupaf.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a5953403545---48720468550.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/46128202727.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/52094963946.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c9fc260d9626d8749bf698cc782513dc/piritigo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084614698748---15885281213.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/72181232477.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c940c4f6a9---sexorifogiwewutupozajuzak.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/3a4d943be872ac0a23481b999f1ea776/80171716342.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ddd2j0kvjv5ueqn8qq4vofah03/15883387312.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6c64df22a---44338343759.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/somekanibivelizawef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=remove+red+wine+from+carpetPDF 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_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 17608 bytes
SHA-256: c4983443eb2d2e02e128aaac7b5b1eebfe6ff37c1b603b594385f7595144a379
font_02_sfnt_off00014401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14401 10764 bytes
SHA-256: b2c814266d8c0c5ba674f1e3cf1b1f66a64233d4a9bad03afaa4cb6da0b59f43

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