Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b73caf506342836…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 07:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92083620683e233c55c68c604e65c53a SHA-1: fa7837bfe023d4628aacfdeaf8a28f063c0d99be SHA-256: 2b73caf5063428363683dc71352bbb04daaf02c18eb7565156d2d22eb8a6f662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO spamming operation. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially leading to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131160a677a5---binidudamaxajisexujo.pdf In PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/27370966159.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/386209948.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/62898820117.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/22305097929.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/14694439166130c4801e66f.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/92595461539.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/69052727492.pdfIn PDF document text
    • http://usagimatur.com/files/others/fonarafaganavuwumij.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/tb6u5c16ci1jbqufj54rqtomn2/30716166942.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/diluxu.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/3921707711.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a43653609---82037665029.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/81a6967149e2484b711caf9acae1371f/4300052588.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161311f121ed05---xinereseroxafataletigak.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/legisowasapikiniburubaje.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/031806331736.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/48881102988.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/95821943896.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161340b282c62d---66779611375.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/pekin.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/36716806947.pdfIn PDF document text
    • http://allier-genealogie.org/File:/21269488954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=example+of+system+software+isPDF 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_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 16400 bytes
SHA-256: a7dbc52cad82294593aa2044030f7c2e90f3303c50208993433de8e89ecc6e2c
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 10700 bytes
SHA-256: 000463c3ef8ea59429e059667843484e07c52e6ccbf774a84b916446da61cb6a
font_02_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.