Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b358175ac99984b…

MALICIOUS

PDF

132.6 KB Created: 2021-07-22 15:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 08fb2d5daf49cfabea1fcf088656adf4 SHA-1: 24e6639906a1ecdd1c1a59b1feead0637fa2a045 SHA-256: 7b358175ac99984bcdd34ebc1195e57d80c0c8fdb1035098f5ee329b23f7a3c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious characteristics, including numerous links to potentially compromised WordPress sites and other disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://zlatartopalovic.rs//files/lububuguvefifajefizulalu.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16070c39e0ea9b---wogenujigo.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/dobegogesizeramif.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/62635031563.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/zitasugureparadurafe.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/kexazitebevago.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/kagolebudubodozulemim.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2125680f4f57d7545ee76b822af63c4c/99697724960.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/41c461554d552bef9cd5d7ce97da504d/jevojulomegi.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/pezexonenetudumusa.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3263e3e9f5---10574410483.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/bitodidawuwafesomofil.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/48740473039.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/fitijazupilu.pdfIn PDF document text
    • https://diphong.com/uploads/zebenoxorosetawupimu.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/27706542275.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/butudar.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/g9pnurbneu8vhr7vblmebvt5g0/94074306185.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2e9d81879---mezawuwaruvolusedukagi.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607562a1f0f1c---16962086436.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/4552463715.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aafc73f04a9---78196096057.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/el0uild8ohvn9lavatqtjphkb5/pozisa.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7abe5d41---89518587416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=outline+example+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_off0001a456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC68 17800 bytes
SHA-256: 6da01d7aaae38f00635f9be07ba33c16e81a7eae15ecdd73b54c35e36b22add6
font_02_sfnt_off0001eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB49 10496 bytes
SHA-256: 68fe16e37746375a6704c0d8cebd11214576183d566fd68e29ae160a91e90ac2

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