Malicious PDF — malware analysis report

Static analysis result for SHA-256 81515f71343a643a…

MALICIOUS

PDF

99.0 KB Created: 2021-07-07 02:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 697c838284cdc9fed7c7040cb3818ce3 SHA-1: 3750d12e1d5b4c67d0a3731efc11bf4429dccb66 SHA-256: 81515f71343a643a84e50fa3717a46eea1840d93b3756ca7171eec65a3197c9c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body is unreadable, but heuristics indicate it functions as a link farm and a callback phishing lure, directing users to external URLs. No scripts were extracted, but the presence of external links and the callback lure suggest the intent is to redirect users to malicious sites or engage them in a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://synerhu.ru/uplcv?utm_term=synonyms+for+the+word+agree PDF link annotation
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/23de8e1e33a813831e35f5b55e118e09/89326573437.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf957f476---6825227088.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/60811962529.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/77660394574.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kifedowijenoziso.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/498978ec729eef8e733a09927f08cdde/jefifetotidim.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/bitunagazipavo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e76e3e130---sewifezeranofuzixosafevi.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/zekagofizotefugesipawad.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/vogatixok.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/335ktv3bgumdr3vef0amph69p6/tizokomezuxelubawusidob.pdfIn PDF document text
    • http://envigest.cz/upload/file/nosusularel.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/4c843bd60e8f1ecda7da64ebe588edaa/belozedijomovik.pdfIn PDF document text
    • https://kopari.hu/files/file/48447728797.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/3091418843.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05ee016ab3---54234640981.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d043778c7ad2aae1bdefbd56b3598d3e/21387985344.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aae2b628af3---zunivokesonojorafeforu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a397003b9b0---bapamemodaximuko.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/63404194502.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1940b4af50db8ddb80efb945203b542a/nulijefif.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/064901a407cd3de4c5ad18a679134760/71551879860.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/82874929019.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d19a6b4657---82702639951.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_off00011e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E21 10936 bytes
SHA-256: d8cb1ce3c5bdfebbb3dd6a8835a9ae407d112ff4b24ffcb02b085265aa217b12
font_01_sfnt_off0001372f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F41 17640 bytes
SHA-256: b58b58c69fc522b1376d06b91594579d3c51242218a0b99bbe7a783b6f644801

Open this report in the interactive analyzer, or submit your own file for analysis.