Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49c9428939f46ef…

MALICIOUS

PDF

91.2 KB Created: 2021-08-14 08:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18c10dbf60c2333b451f1cb4664cd30e SHA-1: 347acccc268ce0ce5d5f1c7eeb130c57cd7a50af SHA-256: b49c9428939f46ef4f1fb6ac841e59e0d466511302248d3e310c0f1ae7f9996f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous suspicious URLs points to an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://emusicmarket.com/upfile/board/files/zojidewiref.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0827d91ac0511df0e787553880507e58/kajixutozedited.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/fajesudebu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/16/file/77281680945.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/zazaxuwagawalejeg.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608f02149a1b1---lamitenalejupasone.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/35717815312.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a0621d2c21d1f22bc94e576bfa0c36d6/96813381263.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/p68bfud0u8tuqk84m36fqsncj7/gesamemusuvavidixa.pdfIn PDF document text
    • https://vestol.bg/files/file/xamijutulidirekutareliti.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/28210879838.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/51284104728.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/72736796478.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/dubewifipamoxadarik.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fugapuwov.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/pegud.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff42546845---19137238722.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/4900632114.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/wosewogijuwapavedogon.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d6d6b9ac2a0a1351460cfee88ea4df6c/tojekisijukaratexizimu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160928d11c2890---1342615396.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/xikidozedukexekazato.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0f38290ad---93519881733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lego+marvel+superheroes+free+play+modePDF 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_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 17568 bytes
SHA-256: b02ea3448710005ff8ccd35aabf1efb4a83d2e947e38d93b732ab9c2020dc093
font_01_sfnt_off00012d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001456f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456F 10888 bytes
SHA-256: 15d841acb36a9a1e0023d9861afa375eb6ff4f7285e48378a3bfd5624906293f

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