Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb60873a2c6b2e7…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 15:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6641783b97769ea617a67eab9b54397e SHA-1: 202b9236989bee072a2ae741b3b6c6a4dc000b12 SHA-256: bdb60873a2c6b2e717f59404a55c9037dbedb41365a1ee9c58dd78341e7ee986
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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://krisoc.ru/uplcv?utm_term=construction+master+pro+apk+download PDF link annotation
    • https://huaku3c.tw/uploads/files/202109071257524901.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d161ce86d7---72348404445.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e6c4104331e24628f1d6079c7078c309/75308629148.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/50311055616.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210909_909DE3B8102C837C.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/nuwiborijibovesukobim.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/damidoxegemibegobupum.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/94373224696.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/14071483962.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c3d8d80---nepivenaririkutizilidir.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/zugexigimizobaluj.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/94784075249.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/kewagoguxivofadebuvaseze.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/33226231620.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/wupizedaputugirana.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/kezajonesinovok.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vegebitato.pdfIn PDF document text
    • https://kvzriu.org/images/file/gizot.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210911042436.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/govufarosugilinaver.pdfIn PDF document text
    • http://watch62.ru/files/files/38055554283.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/22474040503.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/80285427448.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 18900 bytes
SHA-256: 315f51c3c6143d13fdbcf804893ef35b5ffbabff895f549bd0326cd81d4c1bb7
font_01_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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