Malicious PDF — malware analysis report

Static analysis result for SHA-256 161242c17631a4b4…

MALICIOUS

PDF

126.5 KB Created: 2021-09-18 08:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 669a71ba8e910af7924d772594c03f5a SHA-1: 6da6365d3b4ad1e4d00d74de567b96ff4d7d4515 SHA-256: 161242c17631a4b4e960080a811582b86e5f0d9b466c39fbf67cd67b0ea0ba07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://pappteam.hu/userfiles/file/zixupafimonolurabusupema.pdf In PDF document text
    • http://mrpokedb.com/uploads/files/fofatawumek.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd2d268a06---bapomavazinur.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/78970679455.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/27795515794.pdfIn PDF document text
    • https://servauto.fr/img/user/file/xajiwifinopegewezebibogur.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/50337104366.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/39341922866.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/23126085845.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/sexatojupapibodisiju.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/8462214647.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7f7ce659aa430c096e2d37b6d0f2f119/monepizasimagisu.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/vilojapaligefokigilij.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/biwetilevijufifusabiteti.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/waniradosobasumegebubi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m3ua95ert62fninna33fada5ji/jekizizodozibel.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/ludejaxitasizulijojubodus.pdfIn PDF document text
    • https://alohasafaris.com/files/lonerupixuxoguxebixad.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/15683809555.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/25364681155.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/16494021138.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/19532004345.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/39328254983.pdfIn PDF document text
    • http://biosite.ru/images/news/file/lokavurusefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=leo+coffee+ringtones+for+android+downloadPDF 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_off00017f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F09 22548 bytes
SHA-256: 5b73b485f4392624eaf33aeb383a298aa304aa1bba30b43263b420f740a25c21
font_01_sfnt_off0001bb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB73 10692 bytes
SHA-256: 287ed207b5e787f877747ba2ace97b711fed27c40358385d9da0bfaa4075fc0d
font_02_sfnt_off0001d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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