Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd87a1887c420d2c…

MALICIOUS

PDF

79.8 KB Created: 2021-08-25 12:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd511b01ab46dda4134fa655f1f38f1c SHA-1: 8c7ab82c0a9179dfbf5b998c1ba19a061472988d SHA-256: fd87a1887c420d2c1cb7a548ebc8bbab094150a85891942469233975638b4374
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The presence of urgency language in the document body further supports this, indicating a likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59630962131.pdf In PDF document text
    • https://workinhotel.com/upload/fckfile/68286995880.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/71610439272.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/86084037154.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/85988788020.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecd227cc6---65129253211.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/wuviwarinoruxer.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gasivubuge.pdfIn PDF document text
    • https://fishboat.hr/files/88787680305.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/18940708635.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6146e10d---detej.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/bolegogob.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76a9084523---dewore.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/metokakizedijir.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/26329072344.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a35026dd45f---tuwuvalujaxunix.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/gumadeg.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/31868121518.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f35b71f46a0fc4d247195ad27fe4bed8/6841117681.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/7835346236.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/xinuwagakinipetexag.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fd096035d55---jonefajawalimigosozo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/10787644498.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608032be82f9a---nuvuwedamopaxuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+island+video+questions+answersPDF 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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 17008 bytes
SHA-256: 5f38b6c5ce372e9a20ec0d8448fc4fd742d94cc6ee3ab7be88e560fa371cf58f
font_02_sfnt_off00011912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 10708 bytes
SHA-256: 7fbda135a946b6e2e9578c9393edbbf30dcafb8504c398d5960e2b5e3784dbe9