Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4c7359775f8ca5…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 14:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb74275a2f8e374e6f8c9588f47b15b5 SHA-1: f5af937c38180da79c11e556c222e407afde8359 SHA-256: 9d4c7359775f8ca52b556fe28ffa8e7984c58af461381bb9df03726d8e8be173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=visual+dictionary+turkish+english+pdf PDF link annotation
    • https://jpjplumbingandheating.com/FCKeditor/file/64901097356.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/lirimefiwaniritigaxewusi.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/18a3ba2fa347e83bdee5c3c39bde464c.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/21929211861.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161258562def44---mokuwoxaforirofukanezuj.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/92519752156.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3a0fd4d27---kusifufow.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/24/file/20210524_025211_179.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/97314966879.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/61335874990.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/3929359840.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ba684ac2---82361114205.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/bumavupudenafilu.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/69546898972.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/75840946911.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/xowobesatemo.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/94366259861.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/77548161618.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/vivejep.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/zizufamigeni.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b52d1a379da---71335279910.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7c85e95195d1f79d78e1237553dcc62e/wageduwesefogo.pdfIn PDF document text
    • https://kaparatt.com/images/File/lojilutebowuweje.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_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 18208 bytes
SHA-256: f7c1aab724b93d0ee7bb73d004598bd3cbb7c7326ade54d270285843c2c8f273
font_01_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 11172 bytes
SHA-256: 89c13a1020311636ee3b2adb36c19fcc2bb5544b0d0dfc17da0a8efa8402afe9

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