Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fe15ed0eb587b0…

MALICIOUS

PDF

68.9 KB Created: 2021-09-16 13:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c62107649d7eec7953dfc73429373804 SHA-1: 0cba26b9902ef799cac3a1565c5b9e4e7152ea8d SHA-256: 28fe15ed0eb587b0151f1f7484da730574cda0a2eb8e03e32eaa08ba0d5adee5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pattern, aiming to trick users into interacting with malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://coretry.ru/uplcv?utm_term=kuroshitsuji+musical+english+sub PDF link annotation
    • http://mateuszkucharski.pl/admin/file/13128429596.pdfIn PDF document text
    • https://istanajp2.com/contents/files/21993473551.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/volaxurebako.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/bimexet.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210904_A0BF6630105620B5.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rafomuwazutedanezavalera.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/43301626184.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/webafokefokabufipamij.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/sevobivefuligub.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/xitunoruf.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/35382567964.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/84221166126.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/16292729712.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/21261724073.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/18d3531036281898e1fd80b059aff968/kimid.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ab1bbbb2---mopiwav.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/wefutavavanejazaxoperaj.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421cfe911a---33828840483.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb242d71f8---48728092229.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/79230356690.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/ketesitupuga.pdfIn PDF document text
    • http://www.puhito.hu/uploads/xodupikike.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_off0000ad62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD62 11036 bytes
SHA-256: 16816dfc00e12136fb893ba9ea6d60ea4c473c19f0e8e433229330e3dc11760a
font_01_sfnt_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 15512 bytes
SHA-256: 6fd8b4ac628befc0fdd4ce27bc95d7a01243a53419d5f7fe9fe005c8d11bf1a3

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