Malicious PDF — malware analysis report

Static analysis result for SHA-256 77737128481a3f44…

MALICIOUS

PDF

90.5 KB Created: 2021-07-18 22:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7afcd46a7af8d8f14b00a878c06079c6 SHA-1: dfd5d1ffd614cdd684df98f7e633802d7d2b8c53 SHA-256: 77737128481a3f44fb748f0c02eb2674cd145daa46fb981d2257d3b086df7e85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mt-creativestudio.com/ckfinder/userfiles/files/2796543822.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/87ef49265d252d6703e9ea80d60d3a23/muzajibisajotujanik.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/dotilukilukaluj.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/25627324476.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/53595550687.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f77635390d---buripijagedotuzawo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13217dc2a---79185212113.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c400de7ea0---20102240922.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ec457d0b4---ridelanukuxubijuje.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/berodijamefizirutoso.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/29e05e7fba310fe0cb2ffc2d7465bebd/detamivamerelaru.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/lowewom.pdfIn PDF document text
    • http://houselandia.ru/files/63130100604.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/fumavupamogirafina.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/zowixekipaxegi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841fc1f320---zavupaxo.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/vonab.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/da07f01d6d0c657999805e2ba43ee519/bufafuwov.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4689b0c2d9---76153523667.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/voturol.pdfIn PDF document text
    • http://pronobile.de/catalog/file/rasazaterefe.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202107151638269009.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5457479ae---sogobedukemuwe.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609da41e86b05---papazituzowadototugibeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=developmental+coordination+disorder+occupational+therapyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7bae18be---kazukujel.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_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001141e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 17640 bytes
SHA-256: 169fec43abcb42d5fafaabeb0c5eddf250d3acf6ba50728937e0aad289e60aeb
font_02_sfnt_off0001428a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428A 11060 bytes
SHA-256: 22ccb13dc9af5323a4d033d00d41e963ef0625acd37624030504a0b639611a10

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