Malicious PDF — malware analysis report

Static analysis result for SHA-256 d879319be2999afe…

MALICIOUS

PDF

99.7 KB Created: 2021-07-03 18:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 098afc613e4411400386e7c9bae46d0a SHA-1: d1161368a7caa21d52d1f61e6e725942fa54a948 SHA-256: d879319be2999afe81f3bd7e6bb551615b7c8087ea3cd74feb9b7e683beffbae
156 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 heuristics reveal it functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS upload storage. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://synerhu.ru/uplcv?utm_term=black+forest+swiss+roll PDF link annotation
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfba670f0b---20129657668.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f4eb968d---58591397559.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/8927006355.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d35479e4f21---42901895766.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607069aed3d3e---namutamusate.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160717656d5c8f---pimirurefefinidibexewabax.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/sjuaei02a2ickq7iajgdjdmk61/bekarutetisipamexesofal.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/redinegomotazakalujeze.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/furegolusorazubikot.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4964704e---10866604897.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b9ffd7270---79600313019.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a0adf3910---malefikig.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4b7ef4b8092865dad895281b273a9b5/wodop.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/6f49a8c8f4fa7836e09fb74bc8cc3ee2/dolevafenikafosog.pdfIn PDF document text
    • http://adveotec.com/img/file/xovodobog.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/346ea6e6403fb79cf3cbb0aa9686d461/kunuzinufamipeledexo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160728378a7130---16015213540.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 10456 bytes
SHA-256: c496cce8936f14d44dfc588aee8db1ff8eaa3c6cf53bd841cb113e5f3f4ccecd
font_01_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 1824 bytes
SHA-256: 065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8
font_02_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_03_sfnt_off00013582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13582 19724 bytes
SHA-256: 60c640d6fc0a414e0592903625361bce621a5c42497d2433a7eaf9046041b650
font_04_sfnt_off00016925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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