Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d96e16d7d5dc96d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-16 19:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edd7bcf4ed69e42eff576b36fe5fe05b SHA-1: 3735b9fd77d9b7e1ec5e151bc17e3cfb5636a22f SHA-256: 3d96e16d7d5dc96d1ac4294df3c0f5ce9da93bcd748052d06571d7f835bfa963
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=sex+game+mod PDF link annotation
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/bogosulunalovosu.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/modewizapetukirarokokuzab.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/70820052372.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/xonipibuxukibiwakirud.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161349166ae996---fogogotasezasejotanujowip.pdfIn PDF document text
    • http://school15-tyumen.ru/f/kutenazeruzujabodaluwi.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/jezukefid.pdfIn PDF document text
    • http://imbirimbir.ru/files/lomowados.pdfIn PDF document text
    • http://szm.hu/userfiles/file/koloka.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/44640249760.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebaf5a782---59343520838.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/57764071772.pdfIn PDF document text
    • https://labelmarket.pl/data/file/48760668839.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/gekinipubijinikulov.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/xifolikipinukakabirazufin.pdfIn PDF document text
    • http://turatabor.hu/media/66784523436.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/zozejaziralaguw.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/fokejimafupolaxavewu.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/89896564721.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/tawikiwozesawenum.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/96170169526.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a095b4acc7---jadilimizexuvona.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_off0000c6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E5 17468 bytes
SHA-256: 419b7c67c76e3d0f5e0714a3e274e33607ea69ec9ea33f5dc8bc6f9a442443c0
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 10160 bytes
SHA-256: 8952b462b75df7767724a7e70f5747c21c60bf9e30fc03c27c92c1e913badc49
font_02_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1