Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1fa8cf465a83ac…

MALICIOUS

PDF

98.0 KB Created: 2021-07-02 14:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c55174f0fbb08efd1c5b604a15a23afc SHA-1: 629c471ef0bedff51cbe19e3ed8023da2029ee32 SHA-256: da1fa8cf465a83ac398b92ead7b7428c12cebc266feaff97e8d11e3709e2aa38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=word+for+unimportant PDF link annotation
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f1c28edc---famovirakivubijemepavodaw.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d187b016407---40993640144.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/7gvhi5mrtavko404ui53pvuf59/revopu.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jqgqpno7ksbgumbng859u40k50/kefawevuzivujamag.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/63333881835.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/jutizirobejexew.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/siwulore.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/67672649249.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/62922106844.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/77955059285.pdfIn PDF document text
    • http://tipiland.net/upload/file/nawijez.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/uvc4mlgd6rq2ol4og3qjhlo2kq/27705864727.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9l4poje3le40jn48th2jlqfvt5/41142754002.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d56e50296---35723199187.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/216d92fbe987bf99b3009b5bea4fdb30/44201492369.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cafb631185---80216384973.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a93be9fa595c9bd6bfe904e7b30d0dd8/42183983076.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4f6b8f67b---suwozulaxerix.pdfIn PDF document text
    • http://bronia.org/userfiles/file/padosoraxibekiwekus.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/jasoletixididekule.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/26979120855.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8db828fad---65626011454.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/derupesofevexoji.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/85613326444.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ffd5dbaa---figazed.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 17164 bytes
SHA-256: 236518e103c57986abcfbd3746eb7258d6a46a70202ba50566a1f5c907fcbc52
font_01_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10408 bytes
SHA-256: 40c5fe0f555cc976382fd9ac9c842a86cf6e158a86e449cf8453efe95e84282a
font_02_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 23024 bytes
SHA-256: 02d04abe6d44e529a46ed461169f27adb5cabdada07036295b9d7c5e07da97e7
font_03_sfnt_off0001565a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565A 2724 bytes
SHA-256: 55717a362289294580a8d0be1163f0df7ad72a0f7197f17c548c542024ea48f5
font_04_sfnt_off000161cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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