Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acf1d29779868a8…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 09:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4f1ce4bcda3046553b5e6ea9160f0b0c SHA-1: a09ffbd62b460228f0c4fc95f83abdd0517e2ac9 SHA-256: 9acf1d29779868a800a7b2cb98290e9b233c015fd6aa887485b671549ee2269e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The primary attack pattern involves luring users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lqc6fk4v79kioka8k16ncbppk1/vogujifupaz.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/h7baie5gn1boh1l9uoika71fsk/15161662413.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce78d55e9a7---pewuxikizujezibol.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f56372bde---fejixerosipexirasokalawis.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/28223228121.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/wovefadura.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c1da41aacac0874428f3ff4795ed6b5a/81275832303.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160759f78d41e4---lunawesigutuno.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f372c4d55c---35673802306.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b35681b823a---xasigupuzanizagekodi.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/fujimajopugovefesagozenuj.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/9431930934.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/sojinox.pdfIn PDF document text
    • https://hse.tw/upload/file/34978654782.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/67584918006.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6erh88foth08nnboe1dumiol0p/17835569048.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300535125930.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acec2490b01---joketipe.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/jidodifufixiwuxekuvo.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/sewomofisex.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e34235a222852612f2b695c83646368d/pofajarisal.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/xigaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=got+you+shackled+in+my+embracePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 18728 bytes
SHA-256: 259b7fc65b47868f608e97f80631ce47ae27e5091348710577256c6ead44d4f0
font_01_sfnt_off00010220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off00012fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAB 11120 bytes
SHA-256: 609243701d1e678cbae21827fb9291f5e134d26119c5cb4377c956a48627b759

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