Malicious PDF — malware analysis report

Static analysis result for SHA-256 84223f958903994a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 14:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 245de2dbc105685b4813cf4017b592e1 SHA-1: ad30b6f45aad397e389f78d49a9cfda6fc8d3348 SHA-256: 84223f958903994af201e1f0bc2fb06ec7bd68a578fc8f01fb9715ca305a1468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7vpurje31uqv51v8gh6vpph1sb/98683102487.pdf In PDF document text
    • http://jew66.cn/fckimg/file/32377167928.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/72935495158.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/65937960289.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/021f2b1929f7b2713fa88e7a3b3daac1/fewakomebuvod.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/judepifekibawanoli.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/71799529269.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/75091646325.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcee4b23352---37000258193.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/fusalerusexan.pdfIn PDF document text
    • https://ebooksweb.net/files/file/14393087740.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/23265582045.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2be73d1d16---94830625578.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/buvujaluvonupus.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/73931229835.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/25621458282.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b967069a4c---vakonomoxoturedifa.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/41929501290.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/17813623448.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47030201c---zijavubudevi.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/vajikewolufesu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/uis3nop1v556dgkoh1jveb1duq/76254897019.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/jezorigat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+converter+pdf+to+excel+free+full+versionPDF 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_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 10968 bytes
SHA-256: 68d541340fcd94d809dafca07cb44a61706a980947d5ae6dd046ea28d3ef5554
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 16504 bytes
SHA-256: 1747b0d91b42bda9f770cb2df30bc22dbf23425266ccf1dfc33fb332cee88c9f
font_02_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1