Malicious PDF — malware analysis report

Static analysis result for SHA-256 54519d01682e02b8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 03:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c93ed50feb70f52f4c55a9dd41d64939 SHA-1: 6c192208d89f906cb53bbbad9df3cd76c8ee8ea5 SHA-256: 54519d01682e02b804b327e6b08c2841d7aaa61e40c087aca1607fa8f09ae228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://school19-zav.ru/userfiles/file/nidimebimo.pdf In PDF document text
    • https://santehsevast.ru/userfiles/files/46104625575.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/xuwewore.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613550adc9d3d---89268146935.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/fopaposavafob.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/35204023345.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/goduta.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377e20294c8---41467863683.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/84813611569.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/dajudixonutimuxalekumuj.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/309ff6f7e9fb7b25acac2b1c131d8527/zunegujujen.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210907162324.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/xuxufegowetaxixeri.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/05/38980032308.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/64057150709.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b68ce7ffb---nitojegudomev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f083d1c52e---sizovaboroxitanazera.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/89429299639.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///73033960634.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/pikurinugabiduwe.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/moveposovexutasetadixa.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/50016856381.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/pobodisomen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mobile+legends+hack+apkPDF 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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 19448 bytes
SHA-256: 3113382a1e9a4579cca8a87d110f7481083976ee414146261d120bdb4b0c53a9
font_01_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 10820 bytes
SHA-256: 2f375f863ecd6ade888257fa3918c965cf739a501d3837f191f3ebb09bca327c

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