Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab81f672308b3947…

MALICIOUS

PDF

93.9 KB Created: 2021-07-25 17:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7af6754df80c4ede64b4ba4520dbaf7 SHA-1: 8fc53cfc853185e480478b5e31773e9017c4827f SHA-256: ab81f672308b39477540fc891c2cb706774f6297039504db9a21041b25ee35c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and URL analysis point to a malicious intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://asiajitu.com/contents//files/9721752795.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc736edbbe---donabevazanalenexozezar.pdf
    • http://extracam.es/app/webroot/arxius/file/9554035688.pdf
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sufefifujola.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8870da2b2---85535662248.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2dee5735b10218cdb48b48c3b453c65c/zeregitugezu.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3cb3618d4---durazemupulovawu.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/35bc2ccd6fdbe5956b712ac28deceefc/23901518330.pdf
    • http://masan315.net/board/imagefile/file/vupino.pdf
    • http://reneenicoleevents.com/clients/865995/File/85625308238.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/mumovixavobo.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b170984792537f31a082598ce8c04cde/56224007027.pdf
    • https://ludifrance.fr/userfiles/file/15708289350.pdf
    • http://przedszkolenisko.pl/userfiles/file/26608263900.pdf
    • http://vipnjl.com/userfiles/files/1866447469.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eef5323627192983e789716c60892020/51819651190.pdf
    • http://pallenberg-busreisen.de/uploads/files/6391808860.pdf
    • http://shqinze.net/admin/upimg/file///29607992837.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e336b805769f0f8195b405e0a8595881/66943167701.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073412770c58---lapusedizetuso.pdf
    • https://www.qualityitalia.it/ckfinder/userfiles/files/27250827051.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d35dfca958---35277661098.pdf
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/90381881005.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=baldi%27s+basics+full+game+public+demo+android+apk
    • http://e1pl2.nazwa.pl/busy/fotki/file/11037647079.pdf
    • 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_off0001075a.bin
9f7f8a6ead1c7f78061136ddf52351cf2e5b78a70ca946e33b0fc46fe8f6f535
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 11284 bytes
font_01_sfnt_off0001216e.bin
fd74f76bb21fcc46753aec380d3384a8521637d0ff02356cd9fd0b60e5843b68
pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 18296 bytes
font_02_sfnt_off000151d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151D1 16792 bytes