Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaeae6c22b9bb304…

MALICIOUS

PDF

90.2 KB Created: 2021-08-13 15:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de1aa4050f29e5740b8cf51698473010 SHA-1: 6c8f6ceb8f80db71463b808385afbbcc90ccd483 SHA-256: aaeae6c22b9bb3040ac35e8b9cc694ecc110ed5416217541a631fdbf9dc5d50f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF structure indicate an attempt to lure users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=don%27t+go+chasing+waterfalls+paul+mccartney+tlc
    • http://velapower.com/glwh/UploadFile/file/2021072812414173499.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4117266ee---wisigiwebowonulimumugan.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/df0e298573e54919dc85989204477d30/vupolezinotatapesujufo.pdf
    • http://premiumcsp.com/uploads/files/pamikisizas.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baed47434f4---fidixadelidiluzezavi.pdf
    • http://brette-animation.com/userfiles/file/94420688883.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadf5387e0---mudowiviwav.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c4747062cc8989317325f261d130fd7e/zikuv.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/pueeqoj9rkptkbg1nc8ggn0ki2/muvovadopifuvetaxi.pdf
    • http://rnralpha.cz/res/file/91473545366.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a5db1f5a---tofulolop.pdf
    • https://towa-aaa.jp/userfiles/file/8029661520.pdf
    • http://bjxbw.cn/userfiles/file/19888451975.pdf
    • http://leebyunghun.kr/new/upload/board/files/bunagagex.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/q2s128ukvssl6nnhcfse8obqam/50703655494.pdf
    • http://www.netcorp.hu/data/editorfile/ninebakasox.pdf
    • http://acryl-bg.com/userfiles/file/basivokowixetekavumonas.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b646063d19d8c25c78ee2fcb0b5c52b6/duxamawimenu.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dcb47b4aff10fb5e3525d5b9a5a42a00/fexila.pdf
    • http://okeefesreef.com/ckfinder/userfiles/files/kodixebeledigogobof.pdf
    • http://ezstreetautosales.com/clients/876244/File/kibubidatisanakejekote.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c9c817b82---suritojakut.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_off0000f84b.bin
5b8ef7b2310dfdb352722a0641ebaf0f1be7b03d2188d39a0e6fbf0431794628
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 11264 bytes
font_01_sfnt_off000112b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 16792 bytes
font_02_sfnt_off00012ac6.bin
7fcfbb034576f0eeaa46d63a528cef12b0466eb32a5237c0058600eef9808db4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 17696 bytes