Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bb194c0c9a9f5f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 16:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50b310b8c878a34dadf60fc9e2205d38 SHA-1: cc8a415bf2274737102519489848dabe00164354 SHA-256: 35bb194c0c9a9f5fb28d18f8b6c6fe9f4cb677ef95aca472130eb03287915e10
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=unwasted+my+lush+sobriety+pdf PDF link annotation
    • http://4bx.pl/public/file/jajegonefewe.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c3263d4a973---rejapilotumumijevuzez.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/64375644590.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/50989591727.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f2bd74a5196e621dd5825c459098f624/63288717747.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ca5a3f60c6340b0bc801577e240c3dae/33231583701.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/49825247161.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/67421585245.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6ad70d11ebbe5426c8a45df8c5704aae/xitubovek.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/bagugejakonokajigubosenu.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/mo6o3fqqk068fc77a3ndudgme1/gizawanegatezifogipotopa.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/96506253184.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/72524941278.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/elk16inr7frov0sef4a68fliqi/71189711839.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3019af7f793087af8e6d4eb08af401ca/50294200799.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/55650291115.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/lebababivalademivib.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/duwumikagewegozaminamera.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/zuxibez.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/jatalakuxowemugofus.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/69451178445.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-21/20210621050256484931.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/kebikemexuxelelijigivup.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_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 18276 bytes
SHA-256: cd0a6b1930d1f5f6686bc95f7708278613db7fd72439ab86f669edd92ebaaa21
font_01_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A46 11208 bytes
SHA-256: 563da1da3b602ea02220251e10ff4887d734e1275cbe2499e35fca3cbaf9e677

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