Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b4558b27406507…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 08:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 234860a1c045d0e9b84a511377b29fde SHA-1: 7ef74f1ed53d3e97376929895f19793010791a49 SHA-256: b7b4558b27406507a17d1d21972589587a11113401d3922d47ad9dd78a7706a9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://logopeda-empatia.pl/content/file/61073417776.pdf In PDF document text
    • https://sinarwaja.com/account/files/31691863326.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/19403349487.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/fafibafebezufogovatofi.pdfIn PDF document text
    • http://trivio.it/userfiles/files/gejovoponipe.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/pexoguxofiwavu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c432dd36c---lekukofevuzuzopogunerak.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/84606417012.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210905095905.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/60194139013.pdfIn PDF document text
    • http://vhshf.de/File/58573236597.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/86192015495.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5a2f50e9684c1af9268b7486494f8576/jugudu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132080e86bec---vebedofoseteruk.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/toledumejewokelakuxix.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/jaxadagimen.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/romokizaxavoxofabif.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/33155584704.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/gaxokutilin.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091313125173499.pdfIn PDF document text
    • https://cristalensi.com/public/File/maturo.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/24169828650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=katie+taylor+live+streamingPDF 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_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 10624 bytes
SHA-256: 9d2f2f2f6f48fca93cb171c992d54ff2fe1adfbd9c7d6f048cb05d46c7bd6e43
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 17476 bytes
SHA-256: 2149812e299fe6fe4cd799d233c4d810670d4262947885d5fddf3f796466dea2
font_02_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1