Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b56feef8ce872da…

MALICIOUS

PDF

75.2 KB Created: 2021-08-31 02:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 017e966cffbeb25cda2fdc5fb537d2c1 SHA-1: 91ec2bbe369a50dd7aba336fa06c811508cee9f2 SHA-256: 8b56feef8ce872da64e1731b09b3ed0047752c5b287573bf3030024ca2e19b7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crysiq.ru/uplcv?utm_term=ct+resale+certificate+application PDF link annotation
    • https://medtek.vn/storage/file/xizusodujexilisasesupi.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/99771704470.pdfIn PDF document text
    • https://stvorki.ru/files/file/tekusazewinosatoborixo.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/wexovupodinabisoxuribojul.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf14a350e8e---24814162556.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/vikilexijulitom.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/lanupukofomuduxasivudafi.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/vapelikuga.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f7314186a92---46613802133.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ho31iqjmitpdh6bilmmbuciltc/39875277781.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50c1c5e9c---44814252619.pdfIn PDF document text
    • https://atiksigorta.com/files/soxebevagolob.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/acgsck507a0bev2qkvv8nmtl23/lesabofozalawenu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c864b04f9---39046545355.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/385mhbg6ifll3sll4jtfoh5ku7/xixesigugupinozosivuk.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/37337600187.pdfIn PDF document text
    • http://climtech.com/files/files/mitavujevazujes.pdfIn PDF document text
    • http://normel.org/files/upload/file/lumawek.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/1180ng7cruo52re678qu0vp907/2470267967.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/27881076455.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/rumerup.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/46495853304.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/70291377718.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_off0000c3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 10504 bytes
SHA-256: f8727c5288d8e4b56302fda11c57fbc3454c6622fb55f4f7fe374316cf644ede
font_02_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 16528 bytes
SHA-256: c8ec7e5f6a02d5bbaa8516fa86ca200f78cdeb2e83ca109c672a8d5974fa34ea

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