Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe82df702a758e1…

MALICIOUS

PDF

92.0 KB Created: 2021-09-06 03:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c65ae81e96e0177de8cee3172b22cad SHA-1: 743bfe91bea5f371d4ded4e2c0e4ec892361747c SHA-256: 4fe82df702a758e1a07a8f12d196acf2bdad0d7f2e7c813765a7eea9d5b44c7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=golding+the+inheritors+pdf PDF link annotation
    • http://nuitsdartistes.eu/images/file/82878058907.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/20624228489.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/61011572822.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/jugelisepivirawelat.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/39685879552.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/neva02gs1o6u3ueapnd559pah1/vubovevowetakitixune.pdfIn PDF document text
    • http://centromp.it/userfiles/files/96552548681.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/zewefowibejopitexaturaru.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/95847060258.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/jipuv.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/murozujojopop.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/xobirogegiregikage.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/rumiwibe.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/50455346195.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/10516910093.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/62912397767.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608583154f64f---2770682962.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/18278646127.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/59414075026.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/77641159198.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f82c130ae0d---85004548021.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210610034757139.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/a59ef71b89a5daa139959f087cacf2ed/navex.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9620210ce8f6a312904438ef30ad171e/50066104016.pdfIn PDF document text
    • 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_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 18576 bytes
SHA-256: 1031c3cf7f9a62f6bc709bf4cae759829a1e2f61df2995e7a2832104e6777b0f
font_01_sfnt_off00013259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13259 10656 bytes
SHA-256: 9ece2dcaba9d4ee8d98b7540162b450c16b94bf89743e9c325c594923128d833
font_02_sfnt_off00014a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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