Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ee1ef823570bc5…

MALICIOUS

PDF

87.0 KB Created: 2021-07-09 16:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5f90cf9bbfe88297147f501105493b1 SHA-1: d411660603590caa3500788d85d00aacb0f9d342 SHA-256: 33ee1ef823570bc50201b44994630cba1d9f8fa309af355b451c0c2229e01587
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to other PDF files hosted on various websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=doxycycline+for+infected+sebaceous+cyst
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3il7fif1mvgof06anhuos30v03/xowenapivuj.pdf
    • http://ok-poland.com/userfiles/file/fodamigameru.pdf
    • https://amrapalispot.com/userfiles/file/zudizomesefupojatajos.pdf
    • http://www.radiooro.com.mx/media/images/uploads/files/82452090025.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/liropowobawexowusober.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6c75d091a---bovonab.pdf
    • http://qytbearing.com/upfile/file/10419262428.pdf
    • http://fresh-j.info/images/uploadedimages/file/77703702424.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a412a7dd357---nemugoxev.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/318e4e882c65940f91110d2b4db78094/95039644302.pdf
    • https://aurorabersinar2.com/contents//files/mexuzatetegojofidezape.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b48384328d2---fevate.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77762e3950---91188393726.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2aa8e45c49---renivisapulokul.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/85463276103.pdf
    • https://digireg.org/upload/fekijovapewopuzanofu.pdf
    • http://51-lq.com/userfiles/file///63818611569.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/jomowatowubuleriguga.pdf
    • https://securitydm.rs/slicice/file/zarexexutizegexomo.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/resutinepawurapixusuw.pdf
    • https://aravlicraft.com/cmsCart//upload/file/2657554039.pdf
    • https://puppometalli.eu/file/75216137231.pdf
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/3905a4514c6af7ce902e1533a0ba8f4f/50735864737.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824b168428a---vugipedesejematuferuwo.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087429f2b28d---kadumizeja.pdf
    • 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_off0000f1bc.bin
806c33d016785ddefaa5df6bf1776155dca013b64bed07578859854e4f488f0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 16084 bytes
font_01_sfnt_off00011b3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 16792 bytes
font_02_sfnt_off00013354.bin
79c44bb0e057905060bfb02627f1b205832c15e73b1b95262c39c670441a5c1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 10924 bytes