Malicious PDF — malware analysis report

Static analysis result for SHA-256 87395ced7162f61a…

MALICIOUS

PDF

92.8 KB Created: 2021-09-08 00:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3903212d492ed8f0eebd1b4c10a655f SHA-1: beada4c50f048e04bc8bad68e736a44735c43f30 SHA-256: 87395ced7162f61a4cf1981a046145f027876103e6445f7f8339b393bf4f1ae9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan PDF. The document contains a link farm pointing to multiple potentially compromised websites, suggesting an attempt to distribute further malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/njen5u32ncqtp5rriqk8b8lfjj/ludiboxinijotisojido.pdf In PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/37fd6f8f0f49e56de530bec20443f984/63660450012.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/pakipibevurozikupijofimom.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/27795935122.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/mefakipejafutinuxuz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c9d09eac8---pavezarisofatutexalile.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a257cdb69ea---24150447466.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16d4865d8e---93772997669.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/34859582674.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/14757009307.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/47939332163.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f52dc60f3a1b583d0229e62606400645/gitatakizuvugokenerogaluw.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/10f2527f78f09e4b14637561993cba41/35403243782.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210906063248.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/29680183366.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/45324f836ee1dace6e369813c68ed0e0/74077191976.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f2lhm07cquabkeqhonica80lu1/45512643367.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b0c41230c749ece72206e3a4976046b1/venojipasowilolaz.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c0eaba8c---28173190305.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/20156706653.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/dab3cb50476d001e11c8b22f38accfd5/98472380985.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c8db3417b9a731d61528381a32ca4040/befapuduvupuxubitix.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f32724d78---wolufodusujuwuzijuba.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210508170813_1136038656.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b586b8bc9ba63afb23447651357bc376/53444107203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=zareba+10+mile+fence+charger+manualPDF link annotation
    • 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_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 10776 bytes
SHA-256: 849ed1f263a92a0a63a9fde6f224afc9b3bcc5b5109c26105fdd18b0dfcad859
font_02_sfnt_off000137b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B5 17764 bytes
SHA-256: e387549b9ea6d0da6840f57056924734522e0160b6859d9587e4ff6a500ee908

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