Malicious PDF — malware analysis report

Static analysis result for SHA-256 77beaeae69e5f3b9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 14:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74c7d10f509cd545f3d38949b05b0cbc SHA-1: 2091a659fec4db0b99d1a2e9b5e467b5485a66ed SHA-256: 77beaeae69e5f3b9884c0212a2dc7eec683f923537afc43bce2217bb21c7cf50
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links on disposable hosting and the use of UTM parameters further support the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7h638p8btvim7t7nl43ulbovc/jifapoxo.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0631b6e1eff34d3a74a276b70ffd4158/44105782181.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3e0b9caf7---buxageroziwebel.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/27812176037.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/81007448624.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/legaravulozajomefopeka.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/51963316464.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/75611671818.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/norosoneluteronidopigot.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/34016484516.pdfIn PDF document text
    • https://songhongresort.com/img/files/fugorizavufekavep.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/61257902195.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/savarogaze.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfae2bcd07---77711990264.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117bcf32c980---xaguka.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/59764261694.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/815bb64ed75fa4e13ebc51c71bc16aef/15463330562.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b22b4e88bf7---rapov.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/15072801833.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/82668027710.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da2feaed098---zesufubu.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/8714589099.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/fipevinejajejagesevewipun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cours+automate+siemens+s7+300+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_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 17416 bytes
SHA-256: f0ea2de0d5afcef19c9e8c74305a9d33e2dc7ed3886feda9c73ffa3a90b92419
font_01_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 11088 bytes
SHA-256: a61c0f6474cb530499268e71494d0ef5b7328638f7abbfa7886a6711163bad8d
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1