Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa0f30d38eefafe…

MALICIOUS

PDF

84.4 KB Created: 2021-08-16 14:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e7c0bee6b99cd4246e7ec5be1549760 SHA-1: 70ceaaf8424edd6f84f3da69d2bc8407f90993a7 SHA-256: ffa0f30d38eefafebb4b87bcc5a94235cbebda6b5916f5d2f15dc2a70705a922
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/5l3mrsr3tjgqi62t005vdal7s2/21214135457.pdf In PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bca01422496---40547370928.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade340ec471---fepepapeziduxomaregajaze.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/dn0ftcn85q23bdomprbrhq2594/zepixukidariruludufiwufux.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f513e3cdd715c897788d6bca7bb643a2/24899293778.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7h4vlcqtjpine5pa56ienb4o66/jeguxonofevesemadutelujex.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/24807705627.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/nizipusojevejanewalo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/siu7157u5gdg9gpd9o9l4msag7/vopekovivasoduzizoriz.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k7q3g4650cn3g1729ms0umfo56/42915325460.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/genonakiz.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/gegomadedamasuwujofin.pdfIn PDF document text
    • http://gujaratbusinesspages.com/userfiles/file/muzipabeko.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/zuxesagijutawuvojepesuj.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiximefaxe.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/731673d3a6b3c4cc8911c76815ec1cf3/48590401669.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266b337599---tamixokabamalaxof.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/totoxetaso.pdfIn PDF document text
    • https://strechybenesov.cz/content/90301533499.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d7b16d16b---kifexonavi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/35355287482.pdfIn PDF document text
    • http://xsteelstock.com/d/files/zasujobikaris.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/eb63697caeed6c37871bd879d657ffe8/puxigovuwaf.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/95993564665.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/17812178827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=glu+credit+patcher+latest+versionPDF 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_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 10816 bytes
SHA-256: 38c325453b03ab73155ea5e40ed789f404b974155531651aa9b9fbb4e7c7b86a
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 19684 bytes
SHA-256: c45080578cc2f7be8dc4d8e53d48a8606b10a06db8eb7f556cd1223ab1d77b9e
font_03_sfnt_off00013951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13951 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7

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