Malicious PDF — malware analysis report

Static analysis result for SHA-256 c778468dbc4d2360…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 17:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 575beb873fa7c2d27479b2c6ec4302ed SHA-1: add3824d553a68c7d2e475ae326bb70440a7f4d5 SHA-256: c778468dbc4d23605e7f80f4d9639d500fa51d61c5abceaa92d4b46402dc5f78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards exploitation for client execution, potentially involving JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://symbioticlifetech.org/attfile/fckimg/file///20210912212540_785004038.pdf In PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210902131143124.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bocccui0vkc3dmv0ifpdtqdop2/60991142262.pdfIn PDF document text
    • https://best-label.com/upload/files/56951116735.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/94944798422.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/982006603.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/midilixigakawuz.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/715902435.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/62930246063.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16143c3a9966ab---nudurafidadaxigafowuj.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fafbded3224ecb49da08803f416c3666/sezowuliwigitodeburusivo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614793329aa55---12848810985.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/rexelepabope.pdfIn PDF document text
    • http://sgpeo.pl/users/file/rigakulu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/galamegulaga.pdfIn PDF document text
    • http://intertribo.sk/files/4808995824.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/81506700517.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/50255469773.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/25140181490.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vsgscjp236c5g8vta6ahqh4us4/50518216937.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/38177872579.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/56538308624.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/95486166586.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/jusuvopefawoniperobosezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=9+songs+full+movie+online+free+123moviesPDF 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_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 17160 bytes
SHA-256: 1401884818f5d59501e99801a1f79e508ee16b2067d6a7a26fd3e3a2d9f93d87
font_01_sfnt_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 10880 bytes
SHA-256: 53f92b0df8ed40e20f9899b08b439a1115430e69f3775b8db4215169824fc0bd
font_02_sfnt_off0001250d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1