Malicious PDF — malware analysis report

Static analysis result for SHA-256 343cc3bafdf8f48c…

MALICIOUS

PDF

84.2 KB Created: 2021-06-27 21:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8de1fedfea62112e130b648e88657d56 SHA-1: 4118896df70164c2ae1b92d8101ee10d89dfa100 SHA-256: 343cc3bafdf8f48cf117b5e60b6a8d95ff934f2c7333eb48dce3ac6dd85a9754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://paperland.bg/uploads/file/kuxomakuboromumaxugiru.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8e39b77d---73982966869.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/zajidufeloduzinu.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/serebizoregovijodoroba.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/cc4a9eeeab68671a5185a482559f3672/masuzugidegoka.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7j4q6okr0bkg8mibs4rkeqdfup/25507208904.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608669fc69010---ratufu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e681220ac---52588012482.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6737ede8faa6d280a84e900212b86c91/nimijenewovalegu.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/zowiviponaj.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/kakekive.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1v914b7959por61arc8q4quclq/31548680192.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/61067297575.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/lefumerob.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/tevefevovibitiwew.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f68f85081---2294351014.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/navurinu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/efnvumjt44grscttpurt8rovs0/xugebimowed.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b481601c2---28867699988.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/39991045579.pdfIn PDF document text
    • http://uamarkets.com/images/file/godumosigolitetu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e83575b4---danepubepalufepijikopivu.pdfIn PDF document text
    • https://digireg.cz/upload/gavidixafizusebikiwi.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1180bb7abb016e5be0f002ba0bd36277/fuwebevavewobufuzoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=because+i+will+break+your+heartPDF 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://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_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 17416 bytes
SHA-256: 1d2720dc170282fb514f5056a6d91ba5fa8c91cf84de4c9f36d1fbc23c2548c0
font_01_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 10808 bytes
SHA-256: 4cb9f0b8ae49e1f9926d599427aa6a96fd9ee11f7ee7a5e5a54f7070b45ed668
font_02_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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