Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcd14e96340a540…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 12:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf9a17eccfe7f775f6683cb491d53853 SHA-1: e0cc07c2418044b1d5cb72a14d87848b81549b03 SHA-256: fbcd14e96340a540ed1c296a801cf5776bbd5fdaad825c7a25c652cc76e4aaa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://nbc.com.vn/ckfinder/userfiles/files/kujizubojuke.pdf In PDF document text
    • https://aspirans.com/files/file/29975930909.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/74616285479.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/16590425087.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161324527d01e6---40317055671.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/59820091337.pdfIn PDF document text
    • https://stopserv.ru/files/file/rewogorux.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e696db22---86616488545.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vixunetetekupugu.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/fakatuxujabok.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/15281704627.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///26504702722.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/84884227176.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/45829581792.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5a2b260c---kedixaxezo.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/27317984064.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/68823251338.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/newuxaba.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/bidifapavino.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/vulipovugose.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/84347442780.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/gelejitenigekokexef.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/xiwakubejovofoda.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xasazixetiwabubobotazi.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/nefitoduwimavuvaneg.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/figosusufitisexegiboxix.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/60345365954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=harry+potter+chamber+of+secrets+gomoviesPDF 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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 19844 bytes
SHA-256: 5199bbb6453c98ca58f3bc9796f8b2113c2cf3d9e87184d13c5f61db8a5efb67
font_02_sfnt_off00012d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D66 11088 bytes
SHA-256: caeb6de9cd930ab9cb2c009639aa9de026993b00da4f546bb9f86bf5d8a2e9b0

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