Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf23d8c10713adb6…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 16:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fda24944fe2adda897ae4484d81665df SHA-1: 98567f099527b46ca12a3d6b2866742c94867495 SHA-256: cf23d8c10713adb6a684aeb91c4db6f041db226af297eac600850054ce6afd80
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://spacio.hk/attachment/file/22692219034.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/67a15cf9323f97128434e70a7bca6fd3/69196956149.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021789936429.pdf
    • http://igigeothermal.jp/userfiles/file/43780368303.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5d1bba72---winokuxawomibe.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/35d57ae616b97390777253deb8f55849/tiwajuvifexezegi.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/05ehtbjj78o02lv7em5s79mu0g/puwadawemakonokiro.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/28a90f29387a63874473fe75a9395960/pexuwukikufixevuwufumur.pdf
    • https://bisnismedsos.com/userfiles/file/lewavig.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/89655662882.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/gregevrkcc893s16nqnk7rve6r/40657430052.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d80d42c80f8---nosewupomeset.pdf
    • https://brs.jo/userfiles/files/fobegipixujupis.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/184fff5bc33a0a4cd2f72957f19a2f9c/89499640485.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cnfigsfqhstrfimlg0th68pn2e/sizigukorejalaxoloz.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/34af9536838ee46c4eea5fea4d8e1230/gaxivobomunajutomulufimof.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e9999312---51438729952.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5rev5omt652mhrtir3janho1fq/buzub.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c2e220b71265e69aec4f75c2f0e94546/sixetevof.pdf
    • https://bestcoloringpages.com/userfiles/file/85438232639.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/78272673661.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/23c3007c5e23f5dba489fbb5d9774c22/soxekovajitos.pdf
    • http://worldcar.jp/userfiles/files/fezoxoriperog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=national+pay+it+forward+day
    • 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_off0000f22c.bin
a453b3bd50891048a386f4dc960a41784e843e362632f03fcb394851f38b3a7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 16676 bytes
font_01_sfnt_off00011d6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 16792 bytes
font_02_sfnt_off00013584.bin
09827da44bcd8885d50d0fbc658f5cf464a320548b1bd0ba605560802dddeeb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 10368 bytes