Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7650eabe01511b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-08 09:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7a5632731d9cf722c5d4c3f686b947fa SHA-1: b3dc4c9b1afa941134d8a48ca663c3744d33089c SHA-256: be7650eabe01511b7f242929002acc2c187edbab0893ddb3f23fbe894994edfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://service-panev.com/userfiles/34686178610.pdf In PDF document text
    • http://say-international.eu/userfiles/file/92604847713.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/zijazujugowadakemonelulal.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/92a4b306007cd57d6ffa895882be662f/33943525008.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/pafalebazuk.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/48012364702.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/vinedinumonitofebimisimel.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4b4e92ad---20871431190.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/23704713308.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/61293330006.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/mugefo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb402842f2---83564712771.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/11325986614.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/e7dnml8n3hei8lr4kp5bq0o9cf/jorifawujivataxixameki.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/945d245b80ecd54e37b96fb279c3e207/zaxomepimofizof.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/90845361746.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/ledavisikofota.pdfIn PDF document text
    • https://scriptdd.com/_file/file/43911960317.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/wujonuzolalamuwi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79582732330.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900fff7bfc4---jugufanuju.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/52366435165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+torre+attack+move+by+move+pdfPDF 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_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 16964 bytes
SHA-256: 596db255d5da948389d08b24779cd5d941e61a46017e0fbc2ad111a027b766e6
font_01_sfnt_off00011cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EB 10852 bytes
SHA-256: 72c6e463a8c6a70c192802f4c6cf3d189fa3b91c17d7b233b3dd0caaac421027