Malicious PDF — malware analysis report

Static analysis result for SHA-256 308f85d4447017d2…

MALICIOUS

PDF

89.6 KB Created: 2021-08-06 12:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbc14264f165e95e94732ec1ee7c68d3 SHA-1: 5b9f0a8db06cc921e482b8a145500e01947ebfbf SHA-256: 308f85d4447017d2b6835242bf5d36277cdb2e75045006970384d6fb3d12fb39
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve to distribute malicious content or manipulate search engine results. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d258ee4ec7d69c5c9b16bb17d4553d92/demaganinuvizaj.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5g8bc4iasif8ruicmgkbj539o2/banapetejexapa.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/23571545068.pdfIn PDF document text
    • http://deforma.it/userfiles/files/lufidotenebe.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210707_001052_8225.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qr4sf2785g1hsp4m5n2uuvnj31/39869840672.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/pomogudinofo.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/23484069122.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/27119673219.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7aoj8g2d55f808b28hljl5uk90/letagide.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/65081331842.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/24608011869.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/rubijorowofewaku.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/42399872690.pdfIn PDF document text
    • https://aokman-drive.com/d/files/wodufetedanuxodo.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51095c38d---47550221912.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6ca826e4dec2ea327aa3ec049aa1e623/sijugidaz.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/wixevutatarenupogabikode.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5864ff21923aeadbb660c967137659ba/sikamonarovejefazupa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e0498ee0---80572801220.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/7707417446.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/57950135965.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/90d3dfb637aa300487dbc27fa2404620/redemid.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/45032177893.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/nusaguxetin.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/nigazezowabuxaxemonegewo.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/73488418221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=juegos+para+pintar+dinosaurios+gratisPDF 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_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 18804 bytes
SHA-256: b0f1e7bec066d1c68d29098a8fd9423843ce8ab860c8ad0ebe7548f6d3e36774
font_01_sfnt_off000126dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF4 10612 bytes
SHA-256: f71dc710feeaac85cb1ebea8bb78dfac77bf59668638b4be3f9f54a73e2779d6

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