Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0dc649f73d6886…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 09:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 78dfedd2a7c6266a20efea084047179c SHA-1: 8af2ff7a826b2f2331f593ddc6751dc3451efbde SHA-256: 6f0dc649f73d68863c198551397c21d4b5e41a22d64112179c87e284e50f0b7f
156 Risk Score

Malware Insights

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

The sample is a PDF document that functions as a link farm, containing numerous URLs pointing to external resources. Several of these URLs lead to compromised WordPress upload storage, indicating a potential distribution point for malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/56529795945.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607995023d628---23969395909.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/38817788576.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/88dbc97ccda85271c53e845823cf7263/36020983816.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a05880bc115---73514618153.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/nudurebej.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021081622005373499.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3831a4600---47793040865.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/atbt5a1fk8a45al0995j6hag31/50271896637.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vomexitetunolewalale.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/18577939426.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/fazusikenakuxagepubu.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54167928402.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/36455415852.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f07411950a562913c6f3a079b2ea4462/57596302548.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/nuxaxilopusu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hs19ctvc6hn94v8sg9rjhvtaa0/4973467078.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/d5443dc659c4f23f5cc551d649f4e6ad/95427654010.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075440772303---8138195979.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/71088040396.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eec7c73f5---11990207540.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16272499198933.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/62069211991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=steve+jobs+commencement+speech+worksheetPDF 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_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 10928 bytes
SHA-256: 0b89e1e9675874ad95bdb8f3241a8a0fabd3a3ef3f27c2b94a372fe8373449a5
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 16876 bytes
SHA-256: 7f1159af56a3ef7b713d966ce014c49d507db2d418a29b5e60a15936ceb6b8b9
font_02_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.