Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cb3ae5989f47a2…

MALICIOUS

PDF

91.8 KB Created: 2021-09-01 01:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93786153acc05d9bbe43c066945aa033 SHA-1: 2129e896d4baeb81ef5f7d3a53cc6832b49c413e SHA-256: 87cb3ae5989f47a2fca4024614f84a7fc7759e137706ccef251f752826d06fa2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, suggesting it is part of a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nomylo.ru/uplcv?utm_term=hercules+and+the+circle+of+fire+1994 PDF link annotation
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a740f143fc4---sawatefepavufinewikos.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/45824686124.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/82051554935.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e2d61e01bfbe245161fc68500c5cc6c8/dabezim.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/c5i9ppessm6janu6a3e20ge6l3/6678519667.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fecfa3d4f80---tojenon.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b06ed7c58b---7874568913.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210722_886FA9A87BB6C725.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/memitesijobigev.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a0cdd8aaa---31617857715.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/tunapibujokikozurudi.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/84317953738.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5b92a6c4b70995e61d6f74f4f44361b9/87175144355.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/bojudititodemorekip.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/xufogamatutedukema.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8c74eb72d0cd42f4b2436d2a9955dd3d/fozezelaxewad.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7b187d90f63718e3309e21c9075f9a59/ketatitikenaveveguvumovir.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/lulutewufixinekogu.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/19417969431.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c183b164344---pejotutig.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/kelademizutusajozegeler.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/90301cb76e7050902b766ecf3497c559/roxelafapikowu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e330b9c36b9---basutagabituxezudipape.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5886ecc0---95541240972.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_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 10964 bytes
SHA-256: 0a95afa2733b469ad640b47cd2147712cbb69f78e2ef9250bcc1a01c3d3de21d
font_01_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 19072 bytes
SHA-256: 6e2b210dfa3ce12681d39c5ce053d1cd5e187609da30291502b1a22fd848b6c3
font_02_sfnt_off0001464d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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