Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4ae1d46470f314…

MALICIOUS

PDF

83.9 KB Created: 2021-07-13 17:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 23c8e82a2ace7b55d048a41975831c2b SHA-1: 6a266fb4e15bbde47f9aeb00111577f9d9e2b0c1 SHA-256: af4ae1d46470f314ac6a4af50df67980103b2f1308a0dce3a4ce0bb2a358ab05
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 vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some 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 0.9964

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://rdmsrl.it/userfiles/files/jibadi.pdf In PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/8817016155.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/66571335411.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/50483792255.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/38668910311.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074822675fc9---zesirusubuguwaxinalogeb.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/99360740326.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/vobikumavotavaji.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/99659970421.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/duketubiwodug.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/6c80m2lkb17g0n89j8micjuh8j/takopowok.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf5befc54---rikivinodiwewavogobuk.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e49be5d3---30748108529.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087e65b62271---fixaluzokedutumemimekeb.pdfIn PDF document text
    • https://gangnampools.com/contents//files/87943111982.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/14159286149.pdfIn PDF document text
    • http://aplus.to/userfiles/file/jivas.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lejalexex.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ae6e817b940d05858f1ae8a390833765/vogisakesilexiletanazek.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/2877613708.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5818bed9fab18bbf5c4af859acbcd67a/29170284083.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/83ebvgatee621t24qn4hilo0d1/dusikozukev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+convert+image+to+pdf+on+macPDF 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_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 10892 bytes
SHA-256: 336e6c533f204b826752185f07579f8360579128a3c315d289df578d4edd84bd
font_02_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 17156 bytes
SHA-256: 338b72c1e89c91863d4e0c616356e0f5753ed361e19781dce3eabe885c0af927

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