Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca41fb29627efee6…

MALICIOUS

PDF

88.4 KB Created: 2021-10-09 13:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fb7a4eae00fb36c7c54100dc32a768bb SHA-1: d01be5ce183437360e3bd57dbb3be3f4bbe62c22 SHA-256: ca41fb29627efee6db0269c8dbbe328232379df851c4ac566eb771de97e71cb4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to direct users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple external links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://naturestuff.nl/siteimages/file/jewidavisaze.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161342282462f5---rozataxoxiw.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/jiroxigefogoradamad.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/33262033510.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/80115343128.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e2bf4e701d---31801106696.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/vokupaturato.pdfIn PDF document text
    • http://keramann.ru/uploads/files/68970827127.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/mewowal.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210831_170314.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/13376340687.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202110050305087128.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/14003202335.pdfIn PDF document text
    • http://apicn.net/upload/files/63386940185.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_70731759CEFA76A8.pdfIn PDF document text
    • https://e-midas.ro/files/file/wolirojez.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/gunadopeguxobo.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/21939293769.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7d5d1c6f30428f1ec746e1bff780c0fb/jidexopozu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6c5477aa06aacd04c9120d20f8e6452b/83599021194.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20211004_6467072FA4ECCC3C.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/67174341378.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130753192023---tugosakukunurozusu.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/50667930435.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/tugiramidigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=list+of+greens+for+bearded+dragonsPDF 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_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 10580 bytes
SHA-256: b71eb780208c34fdf3d217efe4c805e60f2d84a13935e548c73e8ebbbc6c040e
font_01_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 19300 bytes
SHA-256: 59d97a9a2946282efa1a5af3234e936343cd5d8072266485b1a8ba9d92f4abd8

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