Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4e3d030b632d9a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 21:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09a767b90bc494072e437a14be42d94c SHA-1: ac122064801072806b4f407b9ec277f9afb24780 SHA-256: 5d4e3d030b632d9a29787cedc095e8af8fc303093fa4e8deff184e97e5c0a1b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to external sites, many hosted on compromised CMS uploads or disposable domains. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=efusi+pleura+pdf+2017 PDF link annotation
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/54827686534.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9lhs1129lce1em13lpbkpbck1o/rerenakolusitivufewadoz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jmrdfltbdc141m2i9apcoesh78/12196170830.pdfIn PDF document text
    • http://mega.kz/media/upload/files/2640055961.pdfIn PDF document text
    • http://boldogelet.hu/media/78779003607.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/zojaviripulizaridetuxu.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/lerijixanuloxumuxuz.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/55053460930.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6ca3f7e9---muwadotawerukikesitew.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210607061517.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1605076bf680b8d419bbf4a9e35584d2/21557466030.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/72211944479.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/39112693870.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/fegosevurovaxetuxi.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/wezabedu.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/76850786213.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/96817608927.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/e0p16kahpa71pd97fp7o9jr56i/vupurutifazogo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/s3j8valtkmfvnfhqt1ndjf44sd/zujuz.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7894fd592bbf74393a60ec7fdaef337c/52310146269.pdfIn PDF document text
    • http://speckrepej.com/upload/file/xejekolodulor.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/16351075187.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/94823348230.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 10596 bytes
SHA-256: 9f9a2ad67df1aefb6cd5d5c7f4046a8a38f8087b9e488bdfa3bb953f3f313ba7
font_01_sfnt_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 17620 bytes
SHA-256: b61a3bcd7d6f3b8b0bb8d33a4980177159cd14d277847ea437927c61155bd0c1
font_02_sfnt_off00010eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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