Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc5913a4e99834d…

MALICIOUS

PDF

80.8 KB Created: 2021-06-25 12:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bbe9643aa3427da6ee5463b844006d56 SHA-1: 3e106af82a6e1bd8654e5635623b7f9772ddb07c SHA-256: fdc5913a4e99834df4c7b058c85b568da3e5c32797988d8a8509e44f67dd3687
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=free+mills+and+boons+books+pdf+download PDF link annotation
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ca07f38c---titofezuwevaxal.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/36e9571d8faa57e4c318f91105c4d504/71859563917.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/kabuxojafasif.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/23237382786.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c19008e46---viwixikubarigo.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/povusuj.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/duxoturuwideduxobar.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l6bc12rt3jbi5vevpufee82o10/dafogojed.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tnqu7futvshpj7u57su44ftvkv/94614685744.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607173f02bce4---lofipiliwunonekivobupume.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4b67c3331564d98ac3a7719af6dcdcc7/pofibovozexamanim.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160729bfea055c---mubakuga.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16086b17a43592---borepawuwikuf.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c5e91edf9f4f93a3b1658d1186326726/92571384700.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d0fa80ade79af835c58749565b48e06d/puragewopabuv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC048 10856 bytes
SHA-256: e26daf964d539fe35a2c1e2d19d1218e88516f56940a374be6bf8e963eead2f1
font_01_sfnt_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 17640 bytes
SHA-256: a897504729999176bfc1496269319c04cde94f2e3f0b58e5a2aee7cfeb791a2f
font_03_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1