Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b22e3b31e7e5471…

MALICIOUS

PDF

77.0 KB Created: 2021-10-06 00:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 730e360cc785b89629b3499b219ccfc8 SHA-1: 7fd6df47920183937cb4f25b862cd0f58a243a8f SHA-256: 1b22e3b31e7e54718a6e8a58fa8c91cbee888177c19d7fdef506711f7e787ddf
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links, many pointing to compromised CMS uploads and potentially disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary heuristic indicates a PDF link to an algorithmically-generated URL, further supporting the malicious intent of distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jordan.si/dokumenti/file/43857766316.pdf In PDF document text
    • http://vrzion.com/data/userfiles/files/79389375445.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/0aa77a57c818797b4bab8bed5ca5423d/36579226191.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/72562002993.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/94000615813.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/10/202110060122402664.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/pupasibum.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/abc8f1ef4df9c399c2507ca691815be4/65653731457.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/65887723677.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/dinireribupasu.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/tulizabepezibikuxo.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/pezor.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/sepekenu.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/49654505735.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558ca14fceb---duguxeruberijon.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/mipavosazax.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/sudozinibafureputumakit.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/texununujewunarux.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/goluxesaxotukogemuzotuxuj.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/51585728094.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0cfaab14---romodarizugogizi.pdfIn PDF document text
    • https://cet.sk/res/file/pisupaxarazajuwojonogi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140be287bd95---wajobopojipiwesob.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/pagisera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=do+you+need+a+title+to+sell+a+carPDF 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_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 16800 bytes
SHA-256: ff2b9400409058cb28846fcb1a9687d77a592598753ab8dbed1af5b242c3a0ee
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 10580 bytes
SHA-256: b516e6d9bc1cce85ab071a69f6ac3738ca6eea307f6b26719a357027138972e5

Open this report in the interactive analyzer, or submit your own file for analysis.