Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d141ebe056231a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 23:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 504a424933c5f31966ed0451aac9383c SHA-1: 99f1df560323b1dfaf52a7906b87983313099af9 SHA-256: 63d141ebe056231ae61e08aa0e1ce8e190047f37ce52eceab463ef0f18686815
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to lead users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=clash+of+clans+apk+hack PDF link annotation
    • http://bluecars.pl/userfiles/file/korutemobatanutelabav.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/49929384568.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/54350581800.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/72810317921.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/22091955329.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/98942764787.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d39c62322---13706815988.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/3693245272.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/deraloxap.pdfIn PDF document text
    • https://onwater.my/uploads/file/71152846246.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/jawegaluzazo.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/rifuvixopipop.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/23266435567.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/pupolufijonevetibodalanep.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/69988037819.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d17eaad33---4373513856.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/19633520042.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7d3d23k8fclpk5lrt240ovi07k/3664401911.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/11430058547.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/mozugosatoxirelidirufiwo.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/31237671518.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613967d450c17---33702808505.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zubizufepatajoli.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/72941904620.pdfIn PDF document text
    • 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_off0000c731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 15900 bytes
SHA-256: 3510aa2f69775a433806c6916838f7b3cc25c8f7704055c28cf7102408081d14
font_02_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 10276 bytes
SHA-256: 5b39baabc8b4a4ce4e542446b8940c1de3971fc3d4743463b73258734622d3f1