Malicious PDF — malware analysis report

Static analysis result for SHA-256 1346a76b00531b3a…

MALICIOUS

PDF

63.6 KB Created: 2021-09-17 03:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 89f5086b225e6a969ef340c47481e501 SHA-1: 3c27e581ad73267806eef71ebf402057dc24d9ec SHA-256: 1346a76b00531b3a3ac50654d3068e097aa6d3b5748cb8bbe8926cce0f8b5de5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

Heuristics 5

  • 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
  • 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=how+to+clear+cache+on+chrome+mobile PDF link annotation
    • https://satuldelut.ro/ckfinder/userfiles/files/44707087808.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/28274080890.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/gelitafakafejodas.pdfIn PDF document text
    • https://iwistw.com/upload/files/30180778319.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/47836666695.pdfIn PDF document text
    • http://checopharma.com/upload/files/48395862253.pdfIn PDF document text
    • https://digireg.es/upload/87310261273.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d46dbd669c---loparomamimi.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/nozabo.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/45936917731.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6d57bca87---28258676280.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/86343828774.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/5919835985.pdfIn PDF document text
    • http://chinazzjx.com/d/files/111310202.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8583206fc464bdfe62d75d7350861af5/59045984332.pdfIn PDF document text
    • https://tl-systems.hu/files/files/xepur.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/tetavete.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1d6d7110a47696230d28c7672dbf9fa5/11486696535.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/namasomux.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/8362919442.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16139867132d76---gowawunorodanewuxuno.pdfIn PDF document text
    • https://izr.fr/files/kitumikunenonilibixamovag.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/87722239080.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 10544 bytes
SHA-256: 72c4c0853003da37a57c8cc8851e158d55a105e60568c48fccdf938a2d0387d7

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