Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99b171c18e12be2…

MALICIOUS

PDF

83.8 KB Created: 2021-07-01 12:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97a05c767299f33c8fb4b66d8e2116f3 SHA-1: 5c5cf565cdf77513d116607c02e01a66cc91e5f5 SHA-256: a99b171c18e12be2a41410985b1c132bfbfe84394364af1cd1912ff7b7ca86d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://queure.ru/uplcv?utm_term=long+division+of+polynomials+questions
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6k96ogfln8bcls5rmd3r7098s2/66386516646.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591d6eab55---37603061848.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/97060440163.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9067f618d1a1ea9d1b96b3a3d0db0e8b/79299701533.pdf
    • http://anthonyvienna.com/sites/default/files/file/vufupowojedejubixowesere.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033d69b510---pejorimajotimap.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a69b225386---80998175744.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/vegepabexajenu.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/bbde3d588c5bd6827ddf50685162f807/31165534002.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/k48n8csi1fje9bitejfsfost45/pemulegiganozer.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/h6dkdhc8g11lb3ecc4p5t1u4b5/15995428514.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b93490720---namozasulamobesader.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da803d50b95---parufaxegaposezev.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b88638370---ditakewuxogix.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608db50ba6ddd---3371685569.pdf
    • http://amirafouad.com/uploaded_files/file/60837719943.pdf
    • http://artecgroupservices.com/imagenes/file/65956136853.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb55943688f---luzutinakitikizego.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bac003145c8---govutokubogiwi.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f4a1ee94---42974984299.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dae0212c8b8---45102383780.pdf
    • https://lose-weight.tw/upload/files/65919385398.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/lipile.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/4ldhgae8dsge6u70qngvlogdpj/64793320484.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3a.bin
5f2a87ed485690ae99dd00ffd3dad57dcaf6de75c4981ecbeeee12bb760f3f7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 16144 bytes
font_01_sfnt_off0000e293.bin
83ec1537d7fb0302d026d4ec6494b86b3d1f4f437bcca9700303d0810eb6c365		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 17280 bytes
font_02_sfnt_off00010fda.bin
cd96b9904f12ae4f1296a35731382c66fe0a6090dde27572231d22dad31ac86b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 11124 bytes
font_03_sfnt_off0001295e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 16792 bytes

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