Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb371bc154596973…

MALICIOUS

PDF

128.9 KB Created: 2021-06-26 19:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb305aa8e4933b3b63005e18d5d45681 SHA-1: b9485bbdc6557f6b34735e190ed998d1bf160484 SHA-256: bb371bc15459697348d15ee1e4d365b06aabb665e4df2f7873ae69fef5bb126b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and numerous URLs confirm its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f5df35b17---19452209293.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/cc841fbf04977690a16fbfb1ebc43374/39940564466.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b3443eef8da1534235384acf6390b048/82974437431.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/db103b16661c4d55155df89d6c088fd9/rowupaxupuxefujogorekomo.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a4839aecbf161fe5f3206a260212682c/14915877860.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb7fc47d17---gakanujevodokuvi.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e80c8ceeef92cbba6d36c0f13611dc11/samuvisojijavuwimil.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a24b36adb2---gotimavukonusalokonik.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3571818f9---61456989774.pdf
    • https://argumentua.com/i/file/wetisoladakamamozotafev.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/abb0b511acedd0a5086f514890d83005/44921919584.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/v8k57lat4fma30q6ut1js1mtvr/xipariwifumupevaseviduw.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce4d8d059---85344203904.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4605h1a9unnhbfnpvbo779pcbd/10884392650.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa6e84dd55---8989418496.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e243265d5a501d9d9650d4426d3083b7/25988170938.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdbcf5a927---bipefenowovazemajapekuti.pdf
    • http://soft-pro.hr/upload/datoteke/99413632.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uefqoka1ir5qmskl222ah7euv6/mafonusajog.pdf
    • https://dienlanhbachkhoa.info/upload/files/3661615071.pdf
    • http://axiomestates.com/userfiles/file/wezekikuvarajevonodow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=soil+is+mostly+conserved+by
    • 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_off000196dc.bin
4e8b10653c94c411e99070b5f837048057ae7280aff5cbf080a581720b571ae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x196DC 17740 bytes
font_01_sfnt_off0001c5a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5A0 16792 bytes
font_02_sfnt_off0001ddb7.bin
6e77d49f41be0e429c70f422079109620abb82432b187e7ed82175510c865fc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDB7 10764 bytes

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