Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e425381dc017b4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 04:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 26d740f2750a227d48bebabf4067b199 SHA-1: 86e41297514b04d0a124649d8f6fd764ebe238b8 SHA-256: 52e425381dc017b44077d61d18da0da4f125fe4f95cb890a03548804e6de3e7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://equator-maritime.com/userfiles/file/87955596489.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9340f29ac9---61183834459.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099117e7ebbc---nedadofomubejemunetet.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210701_38DCC0D9E866E656.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/92f7648be435f935c88d8f649c8d35ba/85512081389.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/nivisinenisowusefibu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021820133776333.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/parogure.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a956768b935---59951662733.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/zobobojewafejefatepum.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/r33hl8he7qtkmkdr2tgl03ebc7/99228817767.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/joluwawunoliku.pdfIn PDF document text
    • http://snsi.jp/image/news_file/sudedadalijase.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/5108335990.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/naxiputowejivinilitase.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/rusokasovaditaxifemew.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2647a0fd27---jevupibijupufewe.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/loxepulo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/92843457265.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/nakegarat.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/10578252774.pdfIn PDF document text
    • http://proxima-design.cz/files/file/vepofejevotis.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/pekavike.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/sumurufu.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/66545563757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=usaha+dan+energi+kelas+10+pdfPDF 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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 10832 bytes
SHA-256: 243da28fbff95a2a43195405e1aba23b7276e01ccfc34c68cd7cac1a87616bbc
font_01_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 17368 bytes
SHA-256: e61bcbd722c086fd0b56485e8203c68892e261ed905dde0c23eb45bc7059329f
font_02_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1