Malicious PDF — malware analysis report

Static analysis result for SHA-256 936914901fe658bc…

MALICIOUS

PDF

91.8 KB Created: 2021-08-20 17:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17718eeb972e5890901223d3def8e06e SHA-1: 56df927b8a986ee239bec28efafc65c41fa511c7 SHA-256: 936914901fe658bcbc7b1173898cbef6534f0cad376c290ac889879b90449cba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable domains, indicating a likely phishing or malware distribution attempt. The presence of a link farm and algorithmically generated URLs further supports this. Although no scripts were extracted, the overall structure and heuristic firings strongly suggest a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://oniceh.ru/uplcv?utm_term=bahubali+3+movie+watch+online PDF link annotation
    • http://maekuangudomthara.com/ckfinder/userfiles/files/50853355364.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/53da8a1ec293720d04daa4fa5de7ac07/lunexosubuxelaluxapisol.pdfIn PDF document text
    • https://ptogel2.com/contents//files/52581310956.pdfIn PDF document text
    • https://toocapen.com/files/papinimeranamode.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9dc8630b5c0ff0a835c5a6550e3dcf4a/sarajari.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/11785482119.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f82142501---74622303583.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dpul09iv3785inhuieprgtnun6/wusoxamenabiritesowipesen.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607022c2c4d59---jefenapavun.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/88e792ff9c3370f12e9b3470a6826bc2/jokejeluduzewokikesida.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507121403.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0693eca56---82600132604.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/58424261193.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/warominulofajagitipi.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/lopilutejigivuxep.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/94076842514.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/50691858012.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608160ddc8177---sumobenobe.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/d36bb166415ad39f983bb4c63b6e05c2/nojapafuti.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/14098522914.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/64111310539.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/fe8b1bec0d72f653ac86959585bbd647/32969667183.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2339e0ad4---tugimiza.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/58102143575.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d99fad054ff923687a8bc8ed80fb4254/gozuxixarileg.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_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 10844 bytes
SHA-256: 454463366876cd575c2d6d3c7a4ec8cb4b643eecbed3a7abf6400b972eb11542
font_01_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 16932 bytes
SHA-256: 9317007d950ec30adea1bf5f84ae3dc65a8cbc09a0eb3667128a05c5c4926338
font_02_sfnt_off0001474f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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