Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03c9c0dabaeef1a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 13:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0a047e461133a87c378bbacf6a5d7752 SHA-1: 79e3c513867406025e38b72f64ac46f95b15dc8f SHA-256: b03c9c0dabaeef1a44d5946b6e460fff3131502ce58eb18e0f28e575286e149b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL findings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://mobydick-band.de/fckdata/file/11730652919.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/q2f2vlrp5qu534ht0rijkdov3m/51629778917.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/nukokilu.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/sasajanito.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/nekeju.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ertp27e275730kmo0lebsb8qeb/9843220303.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/86076817304.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/46774538207.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/lajumozesatuguja.pdfIn PDF document text
    • http://gestioniarmatoriali.it/subuvugefejamemi.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/tiginarenelabamezojesur.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/dasipidadowa.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/88181826506.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/523cbfd0e2dcb01e9eade9d903c5e631/8725141765.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/11984377207.pdfIn PDF document text
    • http://mega.kz/media/upload/files/gudejelovuzonufarudavi.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/56964206585.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/pupumogamugabebosifij.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0311d560---pepupenagiluzexabe.pdfIn PDF document text
    • http://fitviewer.biz/files/file/40171656740.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d65813a8ea---giledeled.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/tatekobulasupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=react+native+in+iosPDF 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_off0000cafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 18876 bytes
SHA-256: 6f211853a78546eb7722da224432b7b70e79302e83ae60539831209076527f93
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10188 bytes
SHA-256: 4b6277b9be065d2914314035cceb2f80d461316f5f576b990e895e2a4f358980
font_02_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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