Malicious PDF — malware analysis report

Static analysis result for SHA-256 7175b6d0a14b4d9f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 16:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 964c3acbabc544243838ab987e87a4f2 SHA-1: 5eeeadd97a1503705ec40b5ee613a9109b8c6a7d SHA-256: 7175b6d0a14b4d9f856a9e079b5054e88df9fc3931db4a596d678e6025b3b070
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ML classifier also strongly flagged this PDF as malicious. These factors suggest the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=principios+generales+del+derecho+mexicano+vigente+pdf PDF link annotation
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612949a0289e2---39205740851.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9d0b10ae---82662698709.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/kabatanewexun.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/gubuge.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/18607650199.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9143ec499---venezemizudimadop.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/21133358476.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/kelotokapil.pdfIn PDF document text
    • http://jonme.net/ckupload/files/vigegivovexawemedafew.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9plbtffcgm2k3o8plnm0cf73r9/dojureka.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070709919c81---97414790953.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/91554205286.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/89938077880.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/xowetejabazofalimugip.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/54547394012.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/77049366064.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/fakukozab.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/318d754e7932bbfacde88c373f41a74e/53703449156.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/loboduxedoxarowotowaputel.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/3466599.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a44095430ea---91111424619.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a8ba28b7e629d44f072e84f260ff140f/39403671930.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 11236 bytes
SHA-256: d606070182e82d6f3d33b56481a20fc883da799e5a764f3597c577ba00392c93
font_01_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 21496 bytes
SHA-256: 0dc9dd57ec17717b0b44552c346bd7100f3dbc93128d19f0183fce07b2dc1003
font_02_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1