Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adcca60b43987a1…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 11:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cacdf6627ce0a9237c5bd8207127031c SHA-1: 5454b06ac4d8e95be12d0f411de6bdacbffc5cca SHA-256: 7adcca60b43987a1e03ed8400f0e0416bf910347ba8b02ef8efd89b5ea7e9fe3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=14th+finance+commission+notes+pdf PDF link annotation
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e29e524e---xibakibufuliliz.pdfIn PDF document text
    • https://sambelteri.com/contents//files/goxugitodapudame.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/32368409635.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613540a505b64---47625896938.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/49204538486.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/gesejawize.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/52305753961.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/berewadabofejas.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ce1siuvdcv6ats0a62tq2qf3q5/40834815857.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/177c08524c1bfe862601b029cb6ac7b8/zonejukepomalofederuvug.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/tusovan.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d31823a8---45666629337.pdfIn PDF document text
    • http://greenbrier101.com/userimages/vefuroviziju.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210708_115319.pdfIn PDF document text
    • http://firegallery.ru/img/upload/74507500100.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/92564115458.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b4d9737234c0e9ee539deef40e72b4a6/66134113046.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/kamurubev.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/goworosi.pdfIn PDF document text
    • http://paliukenas.lt/i/File/nofatozutavujalopajiruv.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ced462b11---30753870467.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57e203fe61.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/68781574727.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/lugokivusuza.pdfIn 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_off0000c1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 10772 bytes
SHA-256: dd62866c4b71ae7a974cd7aad8caec8cdf581b0e2be0df36f348e57a4434eee2
font_02_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 17248 bytes
SHA-256: 923d06a6923be75263805b2a738f0076ee2bbf453cc60d128e41b2c0ad3641c7

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