Malicious PDF — malware analysis report

Static analysis result for SHA-256 9583b5c06b7f26db…

MALICIOUS

PDF

84.1 KB Created: 2021-08-04 19:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4f6a5d77e2f4df5789a542ce6a702c27 SHA-1: ab1d5792d9b12534885785ae73733b116fbcf9ee SHA-256: 9583b5c06b7f26db780f14004b26dc98327080b030f35ca6a408b5f61a0c45fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802d127fc1e---xugitekigodojajofujix.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/mqchh78bcn9p7p3crt7usqau53/fekuwabupenik.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc17c781e1---21673642473.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/nr5lge2lstun2mogp0ot8qf536/70780159948.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/sazitanimapolos.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/95771611a31ee1c5f4a0cfa27466d716/69801752428.pdfIn PDF document text
    • http://ahchala.com/img/file/8926697424.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/3hmlib9qjrg00gtfsuqpfalaj5/96587052115.pdfIn PDF document text
    • http://lukinserv.hu/file/36612283224.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077acc81780c---pidawotaperifokej.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/74325162842.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/11793510432.pdfIn PDF document text
    • http://whatdwellswithin.com/file/58332478674.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/titepifofozu.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/46798532877.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210612222702.pdfIn PDF document text
    • http://oodow.cn/upload/file/210630192428111968u0eao6o8ak8g.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16096b8917247f---lasiboduwovod.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/af96q61gqmocc3k71l0ou2eo96/zosiwuduxuvoxev.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae93360fe9---78918898854.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160be559a273b9---lizikedopobunologazukanuw.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/sugoxotefiborelajipulenuv.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a582b9101---40407561568.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/sukot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=where+is+the+thermostat+on+a+dryerPDF 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_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 16872 bytes
SHA-256: df8bcecd09b170e42c7fff7fc34e075b91f7312fd0e60727fc49b4e412ff4938
font_01_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 10572 bytes
SHA-256: eff71e4a20aedac1da07727735d80848b79f8e3fd09bb15fc992dcbafa5b0373
font_02_sfnt_off00012a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1