Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa9b3c4ae237324…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 23:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c217533fce4a1d9ef6e59c172791132f SHA-1: 36ea9cfba110240de0560d1bcb31b6667d551492 SHA-256: faa9b3c4ae237324cdef28063d33eeb1db19339709d5438d62c51cb04e81bbb7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs, such as the one pointing to 'asesorialuishervas.com', are likely part of a campaign to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://tucsokszekszard.hu/images/news/file/mimajuvimatumuze.pdf In PDF document text
    • http://glassick.com/userfiles/file/4678011080.pdfIn PDF document text
    • https://blv.by/upload/editor/files/fixonuxijujunajovidune.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kuvoje.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132435c0a014---12203154086.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/67839470018.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec685d1143---37126609016.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/45969694878.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e45254b5d3---pawojozizegagafesijijewud.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/bukidotatadosulutu.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/wosufosomarulon.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/jakewumapatum.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ljms642fecll0pi2l98sde96pp/wovivagepurudominisuxum.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/zifika.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109140630512982.pdfIn PDF document text
    • http://pileki.com/imgup/file/gamejixew.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210916220150.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/34327338127.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/071021285633.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/zotufepudipetaxurutuzadak.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/jupuwifilanuzesoxutosopid.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/1b26ed5815b66ae8718fee19f477d17e/vugedemifamipab.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/petivibepuluzarox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hot+song+piano+tiles+game+downloadPDF 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_off0000d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 10712 bytes
SHA-256: c84b069e40c9dfc7485431c98151478fb6961152f7992af477e1bb735878257e
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 16596 bytes
SHA-256: b148244b1619c418398b117d0b77a842ea66fb9a4bb330473d3e4577b1081f10
font_02_sfnt_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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