Malicious PDF — malware analysis report

Static analysis result for SHA-256 97177455a1080afe…

MALICIOUS

PDF

99.3 KB Created: 2021-07-01 12:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 903599ad4e2d58d2f33af6b0703d92df SHA-1: 9d5cda6d2c3afb35f974f4b23216234877657fe2 SHA-256: 97177455a1080afe92dfd48cc52389162ec427b6451c9cbc05c4aefc7cb16bb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs that form a link farm. These links point to other PDF files hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=chi+rho+cross+meaning
    • http://assistance.uz/images/shared/file/miselejamujos.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/evt0ggl3422cc7de7hurv5eo9f/35583548546.pdf
    • http://yuha.be/_files/file/nepolazelod.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea1c95a4a4---lewedatanofujosominuxor.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/achk70j7aruv0ltddnkh9507pq/wekajususis.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/83878648617.pdf
    • http://foto-preiss.at/upload_files/files/2837738984.pdf
    • http://thetestmag.com/userfiles/files/14307778537.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cd6082ad---koripofaju.pdf
    • http://jevades.com/aircraft/fckimages/file/bemozonuj.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e608d10dd---xijutezogaxeduwuli.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88b0f798fd---jemuluritapimajixikoveke.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a759add7f14cc5b2967d4838648f6038/zamuludukuzukipuxo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d1927e43---99028855252.pdf
    • https://datatech-int.com/userfiles/file/dujopowo.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c34aa7c3a52---degivum.pdf
    • http://musclecar-taps.com/js/upload/files/xeroxo.pdf
    • http://karate-talence.com/newsite/userfiles/files/85442982158.pdf
    • http://allmedicus.com/userfiles/file/xiwuzu.pdf
    • http://samafb.org/uploadfilefiles/telomu.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607403cad1308---33643304676.pdf
    • http://lavalnerina.it/userfiles/file/noxefebasevez.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c983972b06---10162892520.pdf
    • http://akhsmombasa.com/clients/861898/File/50353632169.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f72c9821cc2893bf30df4c6d048b7620/78360568916.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_off00010409.bin
ba31c946a1a8e8ecd9f964052a56117fe436a2856fa9057eb227fa633d12ad60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 10564 bytes
font_01_sfnt_off00011bf3.bin
148691e139a42d7ca358c40d6d57122be8817ffeadd7641e309bee0dfeabfbab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 16164 bytes
font_02_sfnt_off00013185.bin
8431e2ef5309a2b9aebcf52a22e39c26f3a9be0940ceb81cb38883df2f0fb799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13185 21168 bytes
font_03_sfnt_off00016744.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16744 16792 bytes

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