Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e41e4e0640655c…

MALICIOUS

PDF

92.6 KB Created: 2021-08-10 13:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19d0f9cf86068380b2f302ea8a6e13b4 SHA-1: 824e075d7c607ddedf7ac5299db414b64e983428 SHA-256: c3e41e4e0640655c50f7c455a6e3a670f9f3545d15ee9560ebfbce620c5dbb62
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute further malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous links on disposable or compromised hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cncostruzioni.com/userfiles/file/jogikobad.pdf In PDF document text
    • http://aaronandanthony.com/userfiles/files/49170758145.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081d4b4983ab---buzelanigax.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/rezamasofisekoj.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/73912677274.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ca4912b81d0204f3ec593917d3842a1f/dezep.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/wofefosenoverepomalejuk.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/19107905629.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e03b6d44---palesim.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724cd10c188---49480729828.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161122e548674c---geseregolosive.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/qmrl1uf63ltvfu3024utuje5e2/fabavenuzixesub.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d94ce6714---76155921833.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/35495807096.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/dagasejizeguz.pdfIn PDF document text
    • http://abpaluso.com/upload/file/gakurafokelajokal.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/xefeda.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847cd3b0109---81845303123.pdfIn PDF document text
    • http://leguido.net/files/29441518847.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/vakadevakup.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/68712726412.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/u7na6jh95t8t2lmt8rpven4u91/44107707914.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/cbb58c761b25efd94b5323a37c2f2124/govaduteleturoluso.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/e9a5f3c044c7f54e3a575f3c277ee0bf/40698560731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=jean+baudrillard+simulacra+and+simulation+sparknotesPDF 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_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 17456 bytes
SHA-256: 7e17e2ea731934766df017fc519205a4a7a01613691c42876797fa7bbb2211c6
font_01_sfnt_off00013384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13384 10996 bytes
SHA-256: 22df37cb7a1d596e9b38d5db9cd3e8ea9b9e1753a201074c7fb483516ddf64d9
font_02_sfnt_off00014cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1