Malicious PDF — malware analysis report

Static analysis result for SHA-256 520e48ff57ec9d38…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 04:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b11f55943a2b82d14eb62d726021bc5 SHA-1: ed6235c9024fc8cd5afbeff457b43516cac58973 SHA-256: 520e48ff57ec9d385d6a42688b18578cfeb83334eb09b5af1ff00c6b264f2691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The presence of numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=fundamentals+of+electromagnetics+pdf PDF link annotation
    • https://www.corpeverest.com/ckfinder/userfiles/files/69829622210.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c1433c524---82011578594.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/vojapupi.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/63801695924.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/lidokagatozilimufojuz.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387373ebfab---pelaropiwivowed.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/vupipi.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/zuxupifunanazabosesij.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/54282220725.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/36813851601.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/guxejisenoku.pdfIn PDF document text
    • http://vodnik48.ru/content/file/tukizejesinuf.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9b2edb3b---13146258095.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/sorep.pdfIn PDF document text
    • http://candientushinko.com/images/file/37193074417.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/giradetukinomogezenopobi.pdfIn PDF document text
    • http://runo34.ru/attachments/file/siwoxofo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/91bca6f17e131842644bc25eae50eaa8/xokanuja.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea05d53e2---wibilade.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/binadevedejise.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/milewamuwewipujamet.pdfIn PDF document text
    • http://enewind.com/pliki/file/jimanunotikefedubolu.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/71263355782.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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 16660 bytes
SHA-256: 8f678505da330661cf2c22983c9e945e0bd884713352573ab22c6ab44ebf6b48
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 11040 bytes
SHA-256: a04faefd179d8258f8541524443d56e23805f70ca4481234b4df8a9f03e3b67e

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