Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5973868a9898cb0…

MALICIOUS

PDF

97.3 KB Created: 2021-07-13 08:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aa786b7552ee408639683c9716e63a90 SHA-1: 0db43438ed69427b0720d0b09a704ed7e7e2a384 SHA-256: e5973868a9898cb0aa18553100b3e9ea4de6f87607ae3c0ab4823cdc02e4fd74
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised WordPress sites, identified by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/1dh29q6qcjncoqdvhkjmp2f32l/vazavup.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915da3be2f0---52987933443.pdfIn PDF document text
    • http://absigorta.com/E/file/25795541098.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/83383c5486dfad4c07aaacdbbf12105a/49242926929.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/pekobosajajilozemefi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7fe741da8fcaf19c5f417e15a17095d2/ledewexusume.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d4155d57ac0---99317308109.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/54927493575.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160879d7976abd---40669936894.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/52835688662.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/20520449432.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/juwemap.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c83d63420f165fa0bd78d504731d854e/54566252491.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/osabirakuvilimo.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dtmtq9inpj5ic1s7l3jt2gtpj7/vaxafobatakerivupopajiniv.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/l2sc54qjol7fifp0h143bd2t03/pebanirixeregotememagal.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328a0e3002---55815684467.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/46659353130.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e6137007---zetoj.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/diwudelududegotubod.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6ace3bb07b49c19bbd2bc4046ed395ae/45133468288.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/aa5a2a6fded86875cadd22fbe82501df/29840512661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=posterior+longitudinal+ligament+calcificationPDF 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_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4A 18592 bytes
SHA-256: 24d94efc683c2d0f4a290e6f3f599cac27a2d5c138d1bf4f883e6417018732ff
font_02_sfnt_off00015e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E91 10920 bytes
SHA-256: 15b4a1bc1e136ab96aeecb04b789b1640399255acdf00c2d590c22982d20b6bd

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