Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa61ffb2479bd393…

MALICIOUS

PDF

89.9 KB Created: 2021-08-12 02:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53fcb608cc69dfe26a6f3dd829b43ceb SHA-1: 66968e7e92c9cd57e148661b7d2e310d07dc5d66 SHA-256: aa61ffb2479bd393123eb9cc4a40523946cacded8a3a9464244b5a092ddbdd6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd0225491---25307077896.pdf In PDF document text
    • http://angelescare.com/userfiles/file/gowabe.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/57743040666.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/21552332629.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/luguweg.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba3cec776---39142299454.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/85224587406.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/80553841121.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/32648435319.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/d498ebc8217b8778f6157e0fd9695301/piguduroxefagel.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/70940765134.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/toguzulunezi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc61910a3---zifipasoruliz.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1c2035099---banoxozotus.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78870400095.pdfIn PDF document text
    • http://kingnature.ru/files/files/79777591287.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/26b91820ee7903121fee8769ed7e9f98/pujegub.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df819229fed---3773210479.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/banikutat.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/viriribirapimabewisek.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/fiwufeseravajijovaposas.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/59034992755.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/koxatijejotubuzedolazaj.pdfIn PDF document text
    • http://soupworld.de/upload/file/bibevifoxa.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/19788741828.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/53417970224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=yonder+the+cloud+catcher+chronicles+animal+guidePDF 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_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 20392 bytes
SHA-256: b3abcad34e5b49a87ba0519cfef543fb758861eb47a523c74a7838c809465ebc
font_01_sfnt_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 10900 bytes
SHA-256: c00011d911dd92c01a202ec47f094eb67bc04db84452d0f1644ac32103225743
font_02_sfnt_off00013f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1