Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5dbd8fdff3b659…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 03:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1868676f3f93d830a63c01faa811106c SHA-1: 760a1849ab496c4c58e5299260f7e78f3b09efdb SHA-256: ce5dbd8fdff3b6598c2b791030fe73c9b93767ae0d7b7fbb32441553ea9bb2d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=quality+adjective+worksheet PDF link annotation
    • https://balaji-technology.com/userfiles/file/jimowiniwajofaruxoge.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/sojudegaloweleketipa.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/mief99ne3mnbphu6in53ggrp8m/83144356575.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ccbed9c1---73472741607.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/19234471938.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/pigigilapud.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/80eb5f5a8d06f73fea65fe9b5e1d3018/votevetewibubimuruxidonu.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/56766955700.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/41c8eb4231aa49f20293eab06995bed5/47869918073.pdfIn PDF document text
    • https://jurad.eu/files/file/zowosilujubaworimat.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/nologeviforerebexufubida.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/busadasadasudaduturimiwaj.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/66726205440.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/940dd543eb45061a95893a4b821c0d23/17859057186.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/saxowagubabixomopu.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/toferugoxoreraluze.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607770b6bb18a---26860276554.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/xiwesiwisitusexado.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab8ced850---19508073041.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tigosepa.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7f553c7c3---80161877381.pdfIn PDF document text
    • https://lecachet.fr/docs/files/65669961479.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/puai43emorvdr41tdvipvl7fpm/nufavotufalobowomodedekag.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/81699913813.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pidegekedubedumoporiwubaz.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_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 20916 bytes
SHA-256: 40e9740f0ca4123318a437c52873304316170c047720c3d7d382bdcac830b14a
font_01_sfnt_off00011285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 11012 bytes
SHA-256: 4f3538de1dbc0036249de7ecbf6f0e6554c67734cac31ce12cef40e350a1d6a0
font_02_sfnt_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1