Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad83f41fa2f6dfc…

MALICIOUS

PDF

73.9 KB Created: 2021-09-01 10:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f59e73cbb713c94134447a75ada8eee7 SHA-1: b9b6c10b219ab92387852e996b45d618ec2701be SHA-256: 2ad83f41fa2f6dfc8f893df7f1383b82479b0cbc9cd1466c650e798a5772d49b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

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://sharenkon.com/files/jobogigupogawipomojobisel.pdf In PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/32682329649.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/bonejot.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/60006253296.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/24976077704.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/kexumetarujejefenixude.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/27099300083.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/wemilatibubexusomodub.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72244907051.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/dd2ec3341a9187d25524c3d7f6f3a29e/48118035544.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/40176344409.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/pejuromolusano.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/25431690628.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160830346e3b8a---dixavub.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/6fe00835ec8f326bdeb150f81d4b3058/zezojatokifojajow.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c94c26ab2da---fifezok.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd86918d80---76141348707.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c41b6d204af---23945973202.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vonunatazagog.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/30809933944.pdfIn PDF document text
    • http://archbot.pl/files/file/33750569685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=low+normal+cortisol+levelsPDF link annotation
    • https://medlineplus.gov/lab-tests/cortisol-test/In PDF document text
    • 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_off0000c1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E0 15540 bytes
SHA-256: 1f5f0f57d8a1c7fadaa4f12b84482b89035e2d9e02493af68a7a8c5ece558991
font_01_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 10500 bytes
SHA-256: 7518617c79ffe346274f968bb94eaac9e3dec8954e1694493d7ee26dedff7f2f