Malicious PDF — malware analysis report

Static analysis result for SHA-256 76713644b1e99533…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 00:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21a365367fd17f75f95c0fdd46ab2d2d SHA-1: 5d9a8e82ec098f622153badbab6618a853f76094 SHA-256: 76713644b1e99533c3a6406860d0dbcf6e080419cc85b5ecada5428e62dedb3b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads. The heuristic 'SE_CALLBACK_LURE' indicates the document likely attempts to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and numerous external links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=secret+video+recorder+pro PDF link annotation
    • https://grnca.org/img/files/files/74152188000.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/75587540207.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xorerewizazegewajuteja.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/wesamatuniriza.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/nonodiz.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/rixazofofi.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/40372523690.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210901_57373BAD65B81523.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/90662893189.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/8991627743.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/65725214265.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/20748992064.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/64500482503.pdfIn PDF document text
    • http://df-2.de/images/daten/file/32346028827.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/128081569.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/17234516096.pdfIn PDF document text
    • https://finliz.lt/i/File/17745431749.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/95537963456.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/gujefipoxavafegumuj.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/megujexudatavoziwe.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/66415519992.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/33005977988.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614507e532f5c---70880533532.pdfIn PDF document text
    • http://sjanzee.nl/file/luromefufuwokimukanotijuv.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2514799b63bd30d632b6e3883b1d8d3d/bokiba.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142514a26825---80941956723.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_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 10168 bytes
SHA-256: dc52c2c31fe0b5b68059defb2909bd7e26bd77f46c7a19682eeb5855516e8de1
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 20052 bytes
SHA-256: 51e2200f0c3b653e833e3726ba0db8740be1d8a395ca550afca9e2b4744709c2

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