Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f89646af0e33e8…

MALICIOUS

PDF

78.9 KB Created: 2021-07-13 20:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb1644f3e658cf455a937b6f8f34a83b SHA-1: aa4b4c1785a129992ae1cadea2de13394bb3221e SHA-256: 98f89646af0e33e8b4b4f02e5ab533d2e2fbd3e4eaf7e472f2bbbefd21582452
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/097dbf55f0315a5e1c55226639dcb42c/89335263151.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8upv2g05q6us9efheah0pgsr5/sisijives.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dca4ee947a8---pakosoxisob.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/80055741668.pdf
    • http://zamel2.pl/userfiles/file/jiwobebegazovuza.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608826d221f38---tugefazenenirupiw.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096afbe4508f---fekoxurejule.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c34eabebee7---88991776375.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f9160a323---vumekebizefi.pdf
    • http://sosnovgeo.ru/userfiles/file/87651642871.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb81fb668a---peluwabab.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722d9157f62---giledumalowidoxi.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/405308bd5002ab816707e823aec97dab/35965519265.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e11cf9577b---tutefogagafawufinip.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a7ae9bbc---71483879709.pdf
    • http://tsutae-f.com/js/upload/files/21273848232.pdf
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/43987465244.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/da455c50b4333b65b20537ac2917602e/33807068987.pdf
    • https://produktybhp.pl/pliki_user/File/59792652807.pdf
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/kojilulujekivokopef.pdf
    • http://el-master.ru/userfiles/file/damezokiwujerotenedevom.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b198a9813b---ginupu.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q0v0mfn3a74qqjgd1om04nqp97/zadoladadobuzuvolegu.pdf
    • http://centromp.it/userfiles/files/mogusudewo.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d36e4077---86664825818.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=freak+the+mighty+study+guide+answers
    • 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_off0000d182.bin
3fe154d700599b48629f22e781b22f07fb4d502c3929784d02632330f40ecf1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 10900 bytes
font_01_sfnt_off0000ea65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 16792 bytes
font_02_sfnt_off00010277.bin
3d8660450fec6e7fc87eeb1db9e9141dded128b4574e388a12f9c90d054613e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 16848 bytes