Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c6cfc9575565f4…

MALICIOUS

PDF

68.0 KB Created: 2021-06-23 04:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 81d0f73200da675c40eb489b45b9d04b SHA-1: 5e53d999c99d04464eb88f7d96780a1cca0ef65b SHA-256: 30c6cfc9575565f4da116504957bb9936e382634170ae110415e9e468ab17006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a reference to "green screen muzzle flash free download", indicating a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076929a80c29---xexokipafikunoso.pdf In PDF document text
    • http://allprintusa.com/admin/images/file/nidasufopa.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051504243273499.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607587eba0890---gixavimufafemodub.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/77963716083811cd253d37627e4f3fd0/22407411316.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/gokagadodisofin.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3e7hgb3ooen3g6put5pbgjn4c5/77194582238.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/fb7f8ffa5c56447116ab86aa02cc9da0/wanolojalafibobeje.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/488095707902dce3c79767acf2e91f0d/parapakamasenire.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/88b7084c4cda0212742d13932d959493/nadubuxuratalube.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6qdbvncgu3lq124465hju6a823/tolaxuler.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/627be70e73b3276d6ee75ab223ba3dd0/peputurasap.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9d2fbbf61bff08a193e1176257a56cb4/113997250.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/xesugirisiroguj.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160906fedbb676---xotozikesalodesokekobesup.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6faff7d848---61137843915.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/pusexirurorasixiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=green+screen+muzzle+flash+free+downloadPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 5432 bytes
SHA-256: b7a7f78329acda36c7021d59cee4b2e04b66b29795d0672dda7dfccf41f18c2c
font_01_sfnt_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 12556 bytes
SHA-256: 2bae355525f8c734d0839a2d5a3421c0b90e90a0ce60b5ee292dad9a2112da29