Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78ab48efe60b862…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 21:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f9133f1544188bafc6fb6bedb6212a3 SHA-1: e89d67b6dd080e637b48982d808e7ea3e0994401 SHA-256: d78ab48efe60b862ce1314361f229044cda488474f0aa1645495d0f9c73e3934
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure to distribute phishing content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=vocal+remover+mod+apk PDF link annotation
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a88b46e54---14730267933.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/gibobi.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/bofologixopajenar.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/614322b6d1fb7.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d6638680---neletemof.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/8894301599.pdfIn PDF document text
    • http://bscartridge.com/pic/sivaxixatitukuluzif.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/89260438886.pdfPDF link annotation
    • http://cdn.eagle.mn/uploads/userfiles/files/66125133083.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/goziwine.pdfIn PDF document text
    • http://15881588.com/ckupload/files/78035377954.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/wusajelofireweromapef.pdfIn PDF document text
    • https://theipbuzz.com/images/file/42708166453.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/nobofixawufodura.pdfIn PDF document text
    • http://irollee.com/userfiles/file/wiparoj.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/17107416979.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fbf690df33414130d6d33ea3b62a064e/19309050975.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c712f82c---gagamesapegixepofesu.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/32954725620.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/xutikobewoze.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/wegidab.pdfIn PDF document text
    • http://selidbe-beograd.info/files/pixugerudi.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/seximirumenitelawaronigo.pdfIn PDF document text
    • http://yuha.be/_files/file/99726045479.pdfIn PDF document text
    • http://erpos.sk/data/files/wezekiminu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 16584 bytes
SHA-256: 3e8781040cc44d94f27365ef88885282b4d9f68fefd834399ff7f781ee77c909
font_02_sfnt_off00011eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB3 10340 bytes
SHA-256: e0016f64086a1002d341770fb8a94211f7e918befc9c32254cfca77f2cfe68f9

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