Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b70b9226eb4431…

MALICIOUS

PDF

83.2 KB Created: 2021-08-17 05:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7613f8df18473c848ccf39316787c41c SHA-1: 1486d17624bf8b763d09d7fae9430d39789afae5 SHA-256: 61b70b9226eb4431df19a1bee63c9deb3811302ca2404d8de4047a21305d5b5c
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to use these links for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kltccompany.com/ckfinder/userfiles/files/80174181296.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3efe5285729b04c0cef7236a3b833d15/51652485413.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b605414e096---63226233629.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/tenubezixagepu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af611250a38---lajolutifirujiwikukolabix.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c64f2adc444cdbff0a258c96edf8a0c3/78041336958.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/zevalunewanoxikafeg.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/38075612389.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753e789d026---lovujigixak.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/komilinosorelas.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/23635773386.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/zaturepuvu.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/1948221359.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210717093045.pdfIn PDF document text
    • https://soechi.id/userfiles/file/lufujatalamagowuso.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/kuzosipojulazigos.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/40808769259.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/44350b8392b5da5fa767178fab3895da/mezofozolamopometejina.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/59749833405.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/62886741495.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/efee740f26b57a080561a30e7045be0b/35559795432.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/18730965167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=scientific+names+of+different+animals+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 17000 bytes
SHA-256: 628e60aea3911c811d4473875c367c40fb86309fc215a55cca5bb9454981e5ca
font_01_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 10856 bytes
SHA-256: ed292225115ef498860f19d85966f9807732e2c5f3ac83381d920a5171459a53
font_02_sfnt_off0001269c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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