Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabb3db421cf8c93…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 15:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 596101f3a8d9d58dc8c1984f707e3822 SHA-1: 390ccc49552ce0cece0d5a94cd7070e4ca8ee59a SHA-256: aabb3db421cf8c936ebe57baf73039f0e79f027e91cfa5139887727ac0157b92
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including a compromised WordPress site, suggesting an attempt to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

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 https://idea-web.ro/app/webroot/files/userfiles/files/19220738565.pdf
    • http://lavalnerina.com/userfiles/file/58781045411.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/gelidabapob.pdf
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/waxod.pdf
    • http://jinanxintiandi.com/userfiles/files/86214798486.pdf
    • https://cape-electronics.com/media/file/ruserulorugixajezu.pdf
    • https://pmeds.us/userfiles/file/jisufonaxunivo.pdf
    • http://velapower.com/glwh/UploadFile/file/2021091910470373499.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2a7d935b9---28545889377.pdf
    • http://proxima-design.cz/files/file/buzir.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/puxet.pdf
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/72630998216.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/89c07a0710261bac1f7226a6fa625c57/zodelegawevu.pdf
    • https://roxracing.eu/userfiles/file/dodowadutalebojukunub.pdf
    • https://sunridgecorp.com/uploads/files/202109070324205163.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6b671497c---nakebesipixivelegaduj.pdf
    • http://kingalbertltd.com/uploadedfiles/file/51985665527.pdf
    • http://ombs.ru/uploads/files/lubufozotizel.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/77873986613.pdf
    • http://www.hussco-steel.com/husscofiles/files/milimizotibevidegofoxekej.pdf
    • http://about-dogs.ru/upload/file/sogagosewezozozagubofik.pdf
    • https://vmwarts.com/ecovic/file/48372231207.pdf
    • https://mirrorlink.com/public/files/files/77417619683.pdf
    • http://tamlaproject.com/userData/board/file/32676183676.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161524aa9acc7f---9299878588.pdf
    • http://artospace.com/pics/file/76987847492.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mobile+phone+password+unlocker
    • 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_off0000b1af.bin
63d6ae2b8a92460fa73908781f04087b9e7fda2e7f968cfc96a9262ebae1a462
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 15348 bytes
font_01_sfnt_off0000d881.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 16792 bytes
font_02_sfnt_off0000f098.bin
7bdec753c9ce5c2a01b46e51d43b8fc8302671fa3ba1c037528831dd0bec6637
pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 10924 bytes