Malicious PDF — malware analysis report

Static analysis result for SHA-256 da71df8571d99c56…

MALICIOUS

PDF

78.5 KB Created: 2021-09-21 07:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a3b26d564c1f3cfddb37d0af80c3ad9 SHA-1: a810d3d5dcf6f0e019a3bc49e7c4d0c4d44155bc SHA-256: da71df8571d99c56bc73c2e9c91b86b5c6ffe27bdb05b282ebb3efae2e6cb64d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://archism.ru/uplcv?utm_term=how+to+call+more+than+one+person+on+facetime PDF link annotation
    • http://smart-ventures.ch/upload/Editor_Images/files/dojawopabibenot.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/pegafonulavufetibaza.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/fepefinadedukoj.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9aeac5a2d---lovuluk.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tulofifepal.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/727eaff16d19901e6f53e60343de10d2/konufuv.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/kujisaduwexuxo.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/10743790259.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/83428621005.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/tulapiwapufenimibebizilir.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/zefewagukudusale.pdfIn PDF document text
    • http://vecsecity.info/editor_up/84094227500.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/fusozutoxe.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/gumupubibenebazisadid.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/kifalebupeg.pdfIn PDF document text
    • https://aneri12.cz/res/file/76392583064.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1be337a7192cea3f870c2549f241775b/55679016297.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090115183870554.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/fokugimogolizerapezowop.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909194954.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_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 17296 bytes
SHA-256: b2b8919079ec50e296facf469ca92077c6d41531aa346fa74204e29ed4bd97b7
font_01_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 10824 bytes
SHA-256: b0fd5db1fc719adedfdf97851f13ea900d2131d8bbff9aa339d1f472bec42940