Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25b4dd2b96858b6…

MALICIOUS

PDF

83.9 KB Created: 2021-06-28 01:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f412fecbd2a626ecd5f822f34c531b00 SHA-1: d624821646640e85687a13842cfc5924efff26fe SHA-256: e25b4dd2b96858b6ce56653285954bced4fa6fe3a7ec565a66596264883f0e26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to host phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2274aa855c---26241882459.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbd08d662---wajijudem.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/vigepobivumujajuxozid.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/24bd67c8a18d72b0107c716253751961/widilarabuto.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/kogoferugajekeg.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/wifuwul.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/nanon.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/6577392164.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/8256827057.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/10848986409.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2181acf5---87265855262.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/26734124563.pdfIn PDF document text
    • http://firegallery.ru/img/upload/lepomiw.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb1950414a---56665969774.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0595b6659---jipadonapetodorosiwi.pdfIn PDF document text
    • http://shosholoza.de/file/sukunebigifivakepefopowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=difficult+words+pdfPDF 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_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 16992 bytes
SHA-256: f58489c753a4de7f4ae8cda2c3f2d3ea4c92d0ff5143b0eea0bcda1719aec72a
font_01_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 10400 bytes
SHA-256: 649558023eb8efc5e0c9070c29e6d0e28047b16c4b72c0eac17c084a7fdcb398
font_02_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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