Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8c51839b0b770a…

MALICIOUS

PDF

82.6 KB Created: 2021-08-18 04:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fe6993c149e91eb6475db0edd3e6921e SHA-1: 59fb225836112b5b0c0b4294c29dec67cb3e49d8 SHA-256: 4a8c51839b0b770ac4a33d0100a9996543477d13b6afe6fbedc2d0912e166217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ba324dd5d65---72424516217.pdf In PDF document text
    • http://ahkjt.com/upfile/file/28688700037.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/zenewewesaruriti.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/285h6sq91epr3ccfpfvbi33r89/95400527319.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/62855620576.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/77725701225.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb3bce8d4---30188393052.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/52995966545.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160802173b9f23---xudit.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/koposadiguwivowi.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/14752659847.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/q1f7mhroqgd9tj3iptrma78vbl/lenoluzaxineraguzusi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/s2b46bfg6g186u3vm16o2k58v7/nurasuxibovosuposexepe.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/55094717862.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/69325819920.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/13039956963.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160715e60c92e1---xedumurugutireb.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160892e9e68ce0---27036700880.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609510c5e6378---7186354981.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/mojukamolafabarez.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1b77474c---dizuwixurejimozukurupi.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/91206320224.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/magalemox.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216202229375290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+much+does+asana+costPDF 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_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 10572 bytes
SHA-256: a8dd8b458935826de0a02c7d33b4699aeeb8e89e840a7ce330752c4ebc208844
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 16304 bytes
SHA-256: 1aa552bb32120cb79a86166cb0efa139b4f2e7c5077d8aa09c349644e391eea5
font_02_sfnt_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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