Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ce8af502ec3cb7…

MALICIOUS

PDF

137.9 KB Created: 2021-10-05 03:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 16de84ccf53ce951fc34573b9560b14d SHA-1: 7d23c784061724f0b3136bb47cc42e7e2ee790f3 SHA-256: 76ce8af502ec3cb79f95000787959fd5a573f39960daa2e1ca97f9a5a205da03
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to compromised websites, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to deliver a payload, potentially exploiting client execution vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb316d26d9---80046540086.pdf In PDF document text
    • https://taxfirma.com/userfiles/file/50347191849.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/jikeginevo.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/ledeselumuzesalenokob.pdfIn PDF document text
    • http://lovesenergy.nl/file/jetuxezunemejidugisijol.pdfIn PDF document text
    • http://lovesenergy.nl/file/40638017080.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/42509093592.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/45642530515.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/rafirunasur.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/mawireboronegidazuwi.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/47682175436.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161305b29aecc1---98306750984.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/kizumap.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/rajip.pdfIn PDF document text
    • http://velisend.ru/photos/file/pezajuxojivaxomof.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/lokenunuzerebapedan.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021929752145830.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///90827629193.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/sumimofafimevilipabifarej.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/zemixemazumanositidosas.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/roxusujakamite.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/duxulikodola.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140148e6b25e---terila.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9b303b92---52651602906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=railway+engineering+by+saxena+and+arora+pdf+free+downloadPDF 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_off0001a8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8E1 11060 bytes
SHA-256: a5f4a33411a5332eca2dfa4794a2dc0f6133d1ad32dd74f4e0fb3798341edc4e
font_01_sfnt_off0001c25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C25F 24004 bytes
SHA-256: 05e99e44907c924d4c983df358e15699e88e9e3b19aeb0644bbfa3e4dbe69aed
font_02_sfnt_off00020076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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