Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb73daf140ecb52…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 21:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f18644c8a5add91eac4bc38551653c9c SHA-1: 0412f5359057c3c68127e33fe36a55c84c5d96e4 SHA-256: feb73daf140ecb520d0530dce1b28bcf81518c4cca442548d3ccc76fa15f8193
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://diagcorlifescience.com/attachment/file/bazegigadupino.pdf
    • https://sapsda.com/SapmaUserfiles/file/46051095256.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2b03eaaeb107a0401ddef71d35ce7168/jipul.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/87366920276.pdf
    • https://jechrina.gr/FCKeditor/userimages/file/41105237124.pdf
    • http://twtqedu.com/userData/ebizro_board/file/dafimizelabu.pdf
    • http://cuacuontoanthang.com/media/file/limusijigiwenuxel.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/68213392248.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f0f297c7---kijuk.pdf
    • http://letdentalab.com/img/files/zugipadojumizabenara.pdf
    • http://unipsyclinic.com/userfiles/file/20210909084755.pdf
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/61425910562.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f8971537eecbb9e109a51f0948e5801a/72385342165.pdf
    • https://xn--interpeas-r6a.es/upload/files/josinidodumi.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/82beecf6e46573130aa8cd6be3fb26f8/zevidigaxiwo.pdf
    • https://thietkewebseo.com/webroot/img/files/11635154388.pdf
    • http://yongqingtech.com/d/files/wixetozekerefijiredo.pdf
    • https://upaspor.com/resimler/files/85933267975.pdf
    • https://nepalihemp.com/ckfinder/userfiles/files/68039771682.pdf
    • http://watthaistuttgart.de/userfiles/file/kofojilanudira.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6be375db---xafubunizefu.pdf
    • https://festival-bg.com/media/ckuploads/files/53492144603.pdf
    • http://jacsonsfurniture.com/userfiles/file/43472790256.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=iwant+apk+for+android+tv
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d259.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD259 16792 bytes
font_01_sfnt_off0000ea6b.bin
a728795798cbf55aedb3b132e5c9f77c166679ba8bedba3a1de168c815a9bd64
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 18096 bytes
font_02_sfnt_off00011968.bin
00de4b06b7015f58668f051f44c7cfc30dc6eae205f7eaf1a02eb1a4b6c9ed32
pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 10340 bytes