Malicious PDF — malware analysis report

Static analysis result for SHA-256 adde0cc3672095a4…

MALICIOUS

PDF

74.4 KB Created: 2021-06-24 02:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: be82fc6bd7ad7d72afe69e0125be3d78 SHA-1: e9e51639d0f568e0c2f538e1ec70e6567ac9b0b4 SHA-256: adde0cc3672095a4bb4741dcfcbae7eba13ee3558f54e2c14429c07a15fd83d0
156 Risk Score

Malware Insights

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

This PDF file, detected as malicious by ClamAV and an ML classifier, contains numerous links to external websites. These links are hosted on compromised CMS platforms and disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'superfudge book pdf' and 'wkhtmltopdf', indicating a potential lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=superfudge+book+pdf PDF link annotation
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e9637b4955b77105b36fade840f9ded0/dexotunivebifakelapine.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d205357ab6baaae5a10c5b3dfc62361a/vosurod.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/tapozasurupukuzus.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/59128257328.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bf1f69843fbd33949af64dc095c8e943/zozemazaxixex.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ffafb4f41dac03b518844eecf7204f27/boref.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/bijetepemafunifi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/321ec7d8a7f7713e55e15147a94874a7/dorejanubuxefalo.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/lusinop.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/892d67d75596982a69320e67ab545ebc/falifukumozagotinedejaso.pdfIn PDF document text
    • http://sam-global.info/files/file/dapexawodemegagugudid.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/pidom.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/66ee9e4d66c15197c34840694a7afb95/mixenidofofusamijuxow.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/gijodivimunopozoru.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16096b47db06c1---tuxujitupejigibagunawi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fituma.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/102eba3f684ba9ebd294f42ae5612a9e/vegaxozorafo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/abcb98eeb57142b66543822e5f7fbf95/88061772967.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 5096 bytes
SHA-256: 74e566f4fd560fa65c5562eef66f5955a192fc2f02c3adda03e3887114f61ad3
font_01_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 10292 bytes
SHA-256: e7f538a9d872e77463c8d566a977006478fed03f5c13a3d505c3b889806f66cf