Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcddaf37349f585…

MALICIOUS

PDF

68.9 KB Created: 2021-09-11 21:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72be15c853c1ce5e9979e310ab4dd3e9 SHA-1: 37ac89bde5842d442a558937e0ae59f9e621ee13 SHA-256: dfcddaf37349f585a3c5866de55907d53f20395344a8ea504be266406b5c971c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised websites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for phishing or downloading further payloads. The link farm, composed of numerous distinct hosts, further supports a distribution or phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medgal.pl/admin/ckfinder/userfiles/files/marodojigozema.pdf In PDF document text
    • https://vinamex.info/uploads/news_file/86156597800.pdfIn PDF document text
    • http://4rrecycle.com/files/file/davuwofofugojutom.pdfIn PDF document text
    • https://haidangpc.com/contents/files/poxazavevebojowesoniwuwa.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/81369124088.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/39566884600.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/kajimoxamoviwerefokomij.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/fazeba.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/joziwexijunizema.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/tolakebovekuvajejafegetol.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/tipoza.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba1bbb35b2---8173021109.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/dikanidoxezuritigunazurur.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e83006e7c---72585722019.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/mokidumutezo.pdfIn PDF document text
    • http://bdn10.cz/files/file/tenewap.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/kudilupaxopejotesab.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/fuvezejilosi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d12063ad28deef0df1a95eea4a6876bb/96723863468.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gotenazevitozojup.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/57211351363.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/ed78253596d94bb1e4636fd0526725cc.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/mupakonasemunedowizajifur.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/94317492887.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/tekivapafimoxapivixo.pdfIn PDF document text
    • https://apra.pl/files/file/8765025266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=thop+app+tvPDF 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_off0000b579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8F 9736 bytes
SHA-256: 378d2b87f8c2a21d5015fdd8f26d070c5684f1afdaab7ec51a468bc36ab2f187
font_02_sfnt_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 14196 bytes
SHA-256: dc97c45cb7931732a4d289230cf5fe34846ea9cee6af58e471c8d963a0f2e47b

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