Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c40687714457c6…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 04:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7d0d352fe73e4ec57c9a69888002ad5 SHA-1: 8dd254b1f2ac4acbcc88a1c2994328c723c235b2 SHA-256: f5c40687714457c626b7d724607be6a057983b27c6354f0fc448ff9fc3e39578
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tonmathunglan.vn/upload/files/65189051040.pdf In PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210927_5A59549EA5713EE1.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/40162501005.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/nemupozetadituzeditev.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/69810512262.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/89652374175.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/16734321736.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9aa969b9c3bd9b45dd5b629a8c978769/bujadup.pdfIn PDF document text
    • http://getdol.com/page_data/file/6710924117.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/71117917075.pdfIn PDF document text
    • http://infosierra.es/images/editor/tabapuwulefetu.pdfIn PDF document text
    • http://arsvet.ru/img/upload/99268698767.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/fce2e35a24b9f0cf623964bab7c8c447/zojokuworubesuvabenuvo.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/98195089594.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/xuweperoje.pdfIn PDF document text
    • https://sitarasign.ir/data/file/3385702211.pdfIn PDF document text
    • https://preciseenergygroup.com/media/wezeziwazi.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/gajile.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/34ab0eb84aaea64ae7d13b38bdbb1aa5/xejupuvozigal.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/78792403344.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/jogowubevopumuvonufa.pdfIn PDF document text
    • http://imi.vc/upload/files/13194515991.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb3ebd93f---72435420146.pdfIn PDF document text
    • https://kopari.hu/files/file/nowerejiximozato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+watch+movies+onlinePDF 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_off0000b17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 14780 bytes
SHA-256: 6f5a5af797a02dd5eb5d1a610952078a97d931b2c2eb8837a0968245c8837602
font_01_sfnt_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 10540 bytes
SHA-256: 13ae837a4f2e0fae755cb2f917ddf37f47d1dc9b47985c6adbcfba99ebe090f4

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