Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87a1dd036ee3aa4…

MALICIOUS

PDF

89.7 KB Created: 2021-08-14 18:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ce341b487b0780e42ae3f96cc634696 SHA-1: 7dd53db61c4ffe9f06925ef578b6dda00d4312aa SHA-256: b87a1dd036ee3aa428f631a2b46fc8460b360dfc1ef62c47803081a5e7dc6fcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many hosted on compromised CMS uploads or disposable domains, suggests it is designed to act as a link farm. This pattern is commonly used to redirect users to phishing sites or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=minna+no+nihongo+1+audio+mp3 PDF link annotation
    • https://tantecoccole016.it/file/24322156795.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073753d5d616---97935231742.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/8148411e36639b50e05a7f50d0853e73/xutizewoziwejalutovabef.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3ae6ab8b5---64334688749.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/9491877177.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/12619202865.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/zeruzuxatefepezipuz.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072933b4a7ed---lelebolonekiwigifulu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f42c57c38---walawibosixevusajut.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/20301397026.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/49654189549.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/31761557049.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/nafuranaf.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075937d80fbc---82491295029.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/nanivewerus.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/94299867766.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/81mcf14n623nqs2k2v6ta8usc6/43549327627.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f6b3ec4af---xezudozoxotogutovutodalip.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/xapebidasara.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6546b0e6c---dejakonekusexuvokonifivi.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/bivexurakiwu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cf464e5789f593afc9ec926ed152e126/demijan.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/40501969244.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 2668 bytes
SHA-256: 5ac9d4f3fa20cb5ffc3d75b2ec06ed63bc53b80fd732720f5506314991c04590
font_01_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 25484 bytes
SHA-256: aa872bb4eacdac33febee7d271faeedfbe984171a6aa4da4f94be4847902eeca
font_03_sfnt_off000140a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A5 10612 bytes
SHA-256: 517843188256b2c55fc99e8e60ce32481cf1117a5287a19da936322db788e9a3

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