Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84fc6b539045324…

MALICIOUS

PDF

100.1 KB Created: 2021-09-04 07:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 708b33aa675adfb6ffd0b0afae7417a0 SHA-1: 71021179fad4daa6a2d9e75fa8db014270696f38 SHA-256: d84fc6b5390453246b1580f02ec03788d4ef5b779b65e10033e152ad9bcd545d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains malformed streams and a high ML classifier score, indicating malicious intent. It functions as a link farm, directing users to multiple compromised CMS upload storage locations and disposable hosting sites. The primary goal appears to be redirecting users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://africanresearchcenter.com/userfiles/file/badopakixi.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5d997cea---19541920113.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/e3fae6dacc3c86a4e8443d6a3785657c/fapinepakizemuw.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effc142161---64421919897.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608756dd6832f---88195441938.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721437e8fdc---vinidimejewalo.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/mareb.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/bufodo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8207b7bea297add86ff478eddb4f73b3/76087670263.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f9ff81e2921b8c6f770de900496dfe02/81125428050.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/davavifebubegere.pdfIn PDF document text
    • https://viceda.com/userfiles/file/xoxedoperapufatig.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54bea88f1---simubinuxukiwidubudutebem.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/21350579746.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2f2071a34c2789a3a3243d7533f0bb7d/36912615581.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/34672060372.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12129f335d---gajekisotodazixujo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87317594e5---35682208272.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a612fd90ba---22824963526.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///40715951679.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/kirelijupugifolixiv.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/javunosopaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dietrich+von+hildebrand+transformation+in+christ+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_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 19096 bytes
SHA-256: e16532e4fdab8ae484d5c1aa30fec849e4f02059c9c87b9d8ba0f8f8d561b74c
font_01_sfnt_off000150bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D4 11092 bytes
SHA-256: 32f4687cd2772004b05262aed5431afa09a37dadf1b5b15367cf5160b3d52d6d

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