Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3dd4ba131a93c70…

MALICIOUS

PDF

90.7 KB Created: 2021-09-06 02:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b37f4ffb93f91e57b710880b8f50a477 SHA-1: babccace47c53ec888b9884afe7db27f930eec3f SHA-256: d3dd4ba131a93c701a26d1d40c7fe266434b658a0e419dad53780d448eb4cd88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://nomylo.ru/uplcv?utm_term=sri+devi+khadgamala+stotram+lyrics+in+kannada+pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e42d82c410---46757599489.pdf
    • http://lysfyyy.com/upload/files/pigem.pdf
    • https://panificioilcavaliere.it/userfiles/files/83538114956.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/7pom6jo7tkb241nic2tnmbq9lj/82337431806.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/buwamodisukoba.pdf
    • https://ismart99.net/upload/files/bekafidebatukuvewiwasu.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d3a699e76---51562588986.pdf
    • http://tokyoto.pl/UserFiles/file/bukinipetag.pdf
    • https://hondamienbac.vn/userfiles/file/rafowamujilipebobinomapuz.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72beaf117a---viwowudisudatop.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1caddc9bde---27068409066.pdf
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/77050600546.pdf
    • http://k-souz.com/userfiles/file/68403145113.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c9ab90fe6fbba0760ecd20db14ae1905/79152722403.pdf
    • http://mgocsm.in/userfiles/file/49267611000.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/xukikolujupebavereluneze.pdf
    • http://bagiez.com/userfiles/file/28503128945.pdf
    • http://gzafjc.com/uploadfile/files/kuxemepisukebaxiri.pdf
    • http://baigeleather.com/userfiles/file/75548641031.pdf
    • https://traffictkt.com/viking1/uploads/files/sanodopuvenobebavorena.pdf
    • http://banghetretunhien.com/media/ftp/file/77135215000.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/25ab0lds7bjl5uql9sk8cqvbon/pekekenixawuxuxu.pdf
    • https://haysalon.com/public_html/userfiles/file/birafodevog.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_off0000d6b4.bin
4b71b789b120d890f597442c78ffd271c61da3a70b300ad1dc84d38d14a2dd3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 23732 bytes
font_01_sfnt_off0001128c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 16792 bytes
font_02_sfnt_off00012a9d.bin
4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9D 16104 bytes
font_03_sfnt_off00013fe9.bin
9f0897e14804bb58fb6c4c6101484a23d04fecf8466fcaec2098cec7e0f15134
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE9 11416 bytes