Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71e9539f0642cb2…

MALICIOUS

PDF

121.2 KB Created: 2021-06-28 07:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b56e7d40c5646784d0cd86066eac4f8 SHA-1: 5b7aa816335c40608efbf70e41bbcc6117413792 SHA-256: d71e9539f0642cb24c662849c090a4b6fc05c3cd1ffab43cee5509f4ece2f1f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab6d0c289---40384360988.pdf
    • http://midel.me/userfiles/file/19237636232.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lajo8nanr84mdq2amon2qmoq9u/fokene.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c163df784---nadekovudupenudajej.pdf
    • https://nepalimodelagency.com/userfiles/file/kagosipaf.pdf
    • http://alnadaoil.com/userfiles/file/xomekesotovu.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e31dba656---patije.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/og04k0g4s68lqgl5sck9ffgbpq/39453221609.pdf
    • http://trungtinjsc.vn/upload/FCK/file/merubisa.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/u339ce4kk235ncmh4chgb2jk26/getekanob.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbbce0aff---jixerapuvadejexuz.pdf
    • http://i-dron.cz/data/file/dowoxilasokifi.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/h34s7k3pifvk83pfcj5ei74evn/ronewisisaxedamelelo.pdf
    • http://broadgatecapital.com/userfiles/file/jowoduparaf.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/403b415717e9540ef129e560bbf16ee6/kofitaririvamuzojop.pdf
    • http://skiflogistics.ru/userfiles/file/jawamijofukunakili.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hv0dechigj66kpr4grmbr6ilg3/75687416943.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/0653721d4d305094a59044dbfdc8718c/bopokojokawefem.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/54ec0e6a62513ef494afecb71a7bfea1/jozifakirobutaruzoginoxas.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d7e8533b7f44248d0a483cdd3aab5dc5/65742521998.pdf
    • https://semineebrasov.ro/printuri-fi/files/60466018438.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160706dee9686b---wupuwagut.pdf
    • http://librojuridico.com/aym_images/files/kakojosiwanogurof.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9dba570c8---pusas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=graves+ophthalmopathy+icd+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017455.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17455 16792 bytes
font_01_sfnt_off00018c67.bin
ed409a92277c9751ef116f867f9acd1989af61a9769f8137605edfc6c2712f55
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C67 18124 bytes
font_02_sfnt_off0001bc13.bin
a3b6ac5e1dd81813d7cbe8774399c1b10e234a7d4221b513969e4a9a2ae92333
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC13 11068 bytes