Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5a76cd569e0fd3…

MALICIOUS

PDF

92.7 KB Created: 2021-08-25 18:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0d0992a05e274d25ff9a6033bca8719 SHA-1: 6a171c22e02b15fa8ca59c8503005bd87ed7c37b SHA-256: 7e5a76cd569e0fd3cc0d0b6dc541f508f79a74bf6495a466d8b984e7c2fca408
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document exhibits characteristics of a callback phishing or tech-support scam by presenting itself as an official communication that prompts the user to call a phone number. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may be part of a larger phishing campaign, potentially leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://hbleg.com/admin/userfiles/files/vufopiwinomipudaju.pdf In PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kk1ur3me5q30ut139klo2fed0k/88958340371.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/dedonixoxisuxuw.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210822061424.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/85919487725.pdfIn PDF document text
    • http://starsunited.at/upload/files/9973343453.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/99918067414.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/mukajusu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/rreurq0cef64j2bo32vnkvsiv6/13567081287.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/82659502735.pdfIn PDF document text
    • http://agama-rc.com/upload/files/gifopojodozuj.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03c6cdcd6---11568233185.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/157948275.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/929bfca7d7bfba046dd2570efe1aba0b/50584966873.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/miremefafasavilofuzu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rc3hsoflpv7571p96d1ffb70v9/28680662106.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/8605152279.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/fawezu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/da4b7c5123320c8abc0c1527c912ffd6/23838715775.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/91525304567.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105231624055291.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/fqsdnhleclnt954m98efg0g8nc/21717518575.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/h4nv89gd6557f0tm89s3kueqe0/zimofokafovub.pdfIn PDF document text
    • https://optical-axis.com/uploads//files/202108051144151624.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/mimupozagajif.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/mupitonejuvelubizupona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=island+of+the+blue+dolphins+novel+studyPDF 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_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 17692 bytes
SHA-256: 8e93232c75a99c884754f5dedbd5a58b84c5d503784e8de263aa70c90c202117
font_01_sfnt_off00013110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14927 10864 bytes
SHA-256: 38fe3c6260f3aa13bc68595da92849cbb453c904d11b96d75eb371ad89e51b51

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