Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa38620fe2bea60…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 20:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a28dedb75b8c80aee5bc900f86e0c467 SHA-1: 626f09514adc9dcfafed74cceeffe8f4622ab65d SHA-256: 8fa38620fe2bea60a2da84eb413374e6bf71e30e52546bd3d377abcf8b1ee592
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous unknown-reputation URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=independent+contractor+1099+pdf PDF link annotation
    • http://bindashnews.com/userfiles/file/70812961230.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/96776480534.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/84871692723.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1b6a75bf622f93c886b52a4ac83291d2/rarufop.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/43163646940.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/19071471167.pdfIn PDF document text
    • http://dakov.hu/_user/file/fenuzif.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/55210785333.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/debete.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/34249840118.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/8257394540.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210908_EB31009BB4DB5F1D.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f20909736---47659327721.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0b0c6cee44bfc0b0743b973c2fcbea3b/nerefosonejova.pdfIn PDF document text
    • https://digicpictures.com/downloads/paruzala.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/zilujodam.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/76996412318.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/126f61b7e933389e8b522c63453885ae/49776982959.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/xonomegidogapasegotekago.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/31302187582.pdfIn PDF document text
    • http://serting.eu/userfiles/files/zunoxesawurugopa.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/wobizijuxinifadawu.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/79986099266.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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 10600 bytes
SHA-256: cb41de8e8f67162a60384936af901e70c5b120efd987a2970301de4c50f5b506
font_01_sfnt_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 17072 bytes
SHA-256: f92f6b636dbe0e668351f3a3dcd211b869e135c1203d0e8748a69bf4706ba2a3
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1