Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61928878ffc4c73…

MALICIOUS

PDF

75.1 KB Created: 2021-09-26 00:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8f69a16114fb515f02913bec6a021b1 SHA-1: 7a4c4940294c986dcf6a5d1b245cf2b79e6791ad SHA-256: f61928878ffc4c737fe578d5b5b9f1866c220a58242e01e6a31484adc16caa55
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, aligning with the Spearphishing Attachment technique. The exploitation for client execution technique is also relevant due to the nature of PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/05ad27af62fd533a9791c458491f998d/kininudukadoforu.pdf In PDF document text
    • https://eyetracking.pl/userfiles/file/panotesaxoz.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/29482513335.pdfIn PDF document text
    • https://megalight.lv/uploads/files/donilalagiroxawove.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/tujemawamifasozozisux.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/8051974879.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/21445497426.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/videni.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/tizikunakixonejogolut.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/27964492399.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/najozetawijumozix.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/29058743519.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/p14fgobp69u0s3adok226n05v0/19352579937.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143b63d0e855---75748896733.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/kofasegudofaputazeraxav.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210925135442_5o9nkt.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/31530429328.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/rinib.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/volexevabetubenajo.pdfIn PDF document text
    • http://taigesw.com/upload/files/rutiwigabadopa.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/tikebebuved.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109101417413382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=a+calendar+of+tales+neil+gaiman+pdfPDF 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_off0000be70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE70 10944 bytes
SHA-256: 327423957d1a9ef2920d2891b462b4323858e581215cead009b9d988e4925471
font_01_sfnt_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 18516 bytes
SHA-256: 08e7b4e766724942e4954ea1ab40becc69d77d49e3fc82a99cc96a968695e37f
font_02_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1