Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e742d8ca348452…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 16:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad6e9abe9ec8be48c7be969e8b55b11e SHA-1: eb3143b50f056910106b62d9da5f0729bda428ce SHA-256: 17e742d8ca348452044f6bd86c3a1887dc7be30678df9b53e99f7b6c44592420
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous distinct hosts, several of which appear to be compromised CMS upload directories. The primary purpose seems to be directing users to these potentially malicious or compromised sites.

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://jocafoto.com/fotos/file/duwifedi.pdf In PDF document text
    • http://studioambienteterritorio.it/userfiles/files/7465434896.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835bdeaefc4---suvojixuniw.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/pemerotilo.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2529d753a84f1af9520f68ae8095d897/93758361417.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/61755028788.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/tijuvim.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/49451398921.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kakalowu.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/2773535224.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/fanoworepunifegibawofa.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adce5878621---junelaga.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/78289b91f8f9dd4854b2f41a5a7c6eae/pulaf.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f006380c9b7---bumigero.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607591f101b3b---67023139306.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608f280aa4664---zetikipuvebagaxan.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0925421da6---digugusiwelesez.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/wemagivexe.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16117fdb197859---susususa.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fac374213a---zaperokobufinogupepoferok.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d718beedaca849ed136f4bc621050ea3/wesikatelozawu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/46f4a2a72c1e40ab8ea54c249b73534d/soxodixorunepaxivananomik.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/tapipakokorape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=letters+and+sounds+program+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_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 10760 bytes
SHA-256: 508f2f39573ba8d25385bb3be91bdf9ce90e9ce3b62b9ea6892d9a19b7797159
font_02_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 19048 bytes
SHA-256: fb64aa56c6e6e71f4d95b48578fbeb9e8f2bbfe21024cec1f32d8fe80214e2f6

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