Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37acd954801e55a…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 21:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 475d69a9d94bb2dc4ac56afb4f257013 SHA-1: 634d0a537d579debd23eeee4e05d79bc47ea628e SHA-256: f37acd954801e55a7628e172e4f99703556e23329c9ab877aed70e34dc25cc9e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the document, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://synerhu.ru/uplcv?utm_term=olympic+size+pool PDF link annotation
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/7ded49b245ab99108cfe7bf6ff63f2e8/dodesitoboxaxapejaxu.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/59975097197.pdfIn PDF document text
    • http://computerdoki.hu/user/file/fenajunimarafuke.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f96e09457---lidopubirubafu.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/witamenemedawe.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160987b5d7d64c---defononotonozen.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/xapuxumopufur.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bd858d4c819---xozebavugujaveji.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/11087877107.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e23072844---62248849504.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079662e076c2---pebifizavomamolajixel.pdfIn PDF document text
    • https://castel.ro/userfiles/file/dufidedibesijaravo.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/4082051953.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d154d9d87b---dozobaxizisukojido.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/82045599404.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/92be19dfbce655e60b69c353b852c006/mazerorakidedik.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb5c2c4fb---nulutikejanozedupiresexat.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/254lv2i2tccs8hv0jc5qkeojt5/gakosimaxilibabumoj.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/92923301367.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608283d6879b4---77478149949.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/salizomasog.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a9c05a6c62fe59c331b8a58a7ae3c09d/76121571689.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160754a3ae7d65---fujezifipekokamese.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/5v8tkrm3mlchmfj6v0jsorg40p/31734625587.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b3e6ded6893f3a71156bd638033d7f45/91930092270.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b3a5f1366dfbb318a3624a292cb1e106/72777282628.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609825199e5bb---93096172672.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_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 16820 bytes
SHA-256: 03371ed0fc85a4e1f0e3e9fcd60e3841cef87543dc802f6a6e4b31f431667fa3
font_01_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 10268 bytes
SHA-256: 87d52d62b1ae2080c8c66158624ecdf7ba64013a94145da3638783a4c311a052
font_02_sfnt_off0001374b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1