Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c28c97ca432b7c8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 05:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62045dedb0372e94d6d562d3fd772daf SHA-1: 5821c6424f2040c319d52e753e70209b7078814c SHA-256: 5c28c97ca432b7c83ea4d32f442a35cd0712e933ea594ea3d6041aa3d9ef13c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm, redirecting users through multiple domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/vibafutakixanan.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/62a23b5df81e4c7a0bc8d4e726583251/20559121028.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/kidigutiwezelulis.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/78478376044.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/numosu.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/vezavagifawosurekibaben.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/15464930207.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/wapipegifuw.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/37517378723.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ab7f0497a265ac6d51b69a523eaab229/62067830125.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/sugubulolekevura.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kositopodipogolejenog.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/84765016678.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/roropatopukufeb.pdfIn PDF document text
    • http://trivio.it/userfiles/files/megelosumofekixavar.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/97086494394.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/kuzezogelekimisokel.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/kenabojimawirusati.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f312ef372f---pudalusukodezidedofu.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/jolamofijomizoloxapek.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/15609842404.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/lubogiritelupuwim.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/08234ec6b038e5b2cb307e796e63e310/duziku.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/wagofumazuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=world+of+tanks+mod+apk+downloadPDF 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_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 20320 bytes
SHA-256: ca33442a68e1b6201fd1bdba6d131eb281850e68e4aa9cbc1df2c140c8181e0d
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10608 bytes
SHA-256: d08c14e52e72a5b7f989437488a93c7c5fa00f609a2472be09775564b279c148
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1