Malicious PDF — malware analysis report

Static analysis result for SHA-256 132bb18a9db4b03d…

MALICIOUS

PDF

98.4 KB Created: 2021-09-01 10:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f537314f6a1654070ed20ecb0d737a52 SHA-1: f6b3c67e700f6fe8cbf8afc8d83ed1c03d5bdd02 SHA-256: 132bb18a9db4b03dbc8dea0d1e594ec4b8d2038b4f3af5cbcab0dc7082943e43
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites and disposable hosting. Heuristics indicate this is a link farm designed to lure users to external sites. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/5ecrim9vsgcqf1tmrp81k2lrs6/94721740168.pdf In PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847cefa8f71---mowagavoruvujo.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/witiwejubovixijajek.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/xapagufo.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/zalinul.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/13792427989.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/zaramotetunijer.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f0d86e60874b80480a789797035ab93c/gejavikeza.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/19484135167.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/5mcpirv41me9l9547v4fvhibf1/resebinu.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/38104749898.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/pomiliwafutil.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/nld9pnudt4ep2ljasb24oj4hv5/sisoxuxeworafewise.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8652b8cf57b931d16fa14c1074887950/14858461429.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c57d7101ece---napubawuzoduluku.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202108161632167844.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/vobowuxotuve.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ubgfg1tk1puk1m8efbmu6thu6m/kamutegajororofive.pdfIn PDF document text
    • http://planbmedia.hufiles/gejafodinumixewewitesag.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/29161245571.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909401d7976---28170828312.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/kizunemoj.pdfIn PDF document text
    • http://studiorampinelli.com/file/ximok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=emerald+tablets+of+thoth+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_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 22864 bytes
SHA-256: 33a8646351820f90360e6b19065710a6c37261d5206ae9ead8ad1463db73ee56
font_01_sfnt_off00014a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A53 10692 bytes
SHA-256: 92b6913dad260f51511120c29738244482fbe1d74a3d9c5f85af585997a5376e
font_02_sfnt_off0001628f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1