Malicious PDF — malware analysis report

Static analysis result for SHA-256 281d25a7351fc2aa…

MALICIOUS

PDF

91.6 KB Created: 2021-09-02 02:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4154479e498701c265223681f8ef83d4 SHA-1: 3b2ad97f10492ed7bf7e1b653528019ed25a1c12 SHA-256: 281d25a7351fc2aa46ab75a5c72345257e957784d0e428581ed399dadf854a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://aradovan.com/userfiles/file/lanofi.pdf In PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52501cc85---75000940459.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f3c32619---97557968089.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/21267019273.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/53698267423.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210718221211.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/88330f2b45f79866bd0bd5e21d9ee139/munipe.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bfb4f0e4f3f---62086153778.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/ferumirivejusanazepaji.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/muzabijuruwoga.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/dalaniwilodebogijotuzaze.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/lojexuloza.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5j5pp489dt308amu2kte38jjkb/tatusamefulinil.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/texezigotamizutum.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a364d078---83073681436.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210612045329.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/26027550e51587e40d0d0f9e1ef43e1e/85495010613.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70571083324.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/roruxipumorobowawesomu.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/berexozewetazuro.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/nedorigekuvajujofulo.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/810001c569b400bc760af62d0a09186e/videduzokevatarukotomebij.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/19717819341.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/76892158795.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/33410838454.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/fatikobinefategono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=command+line+arguments+for+fortnitePDF 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_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10828 bytes
SHA-256: 7df299f3882775b437e9f700117211f680853cbfb46bc9dc8bf5f512bcf5eed2
font_01_sfnt_off00011774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11774 18636 bytes
SHA-256: 94dc7da5a1013e703e1142a1076e3dd6454cdc0bf8dd1dbb720c6ce92fd590f9
font_02_sfnt_off000147cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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