Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57c2cf3bc8301cb…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 21:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49a66a3b407e262cebdfda3cd4a1d7c3 SHA-1: 07a0ea3d67102dd65c93a0aad7976ea6dfc59f50 SHA-256: d57c2cf3bc8301cb7e649cfd4f1d0a52d3b41d9c4b814691e8d347839eec179d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/uplcv?utm_term=national+guard+and+reserve PDF link annotation
    • http://mmbc.cz/_data/user_files/file/43521432450.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/33663150437.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/76079109486.pdfIn PDF document text
    • https://egf.tw/test2/images/file/lizuz.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/45377205051.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad0245858---31635786719.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9dfbb57c7c6cc2d53bf5ca308fe273d3/32999524436.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/liwexukinabu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/46d9f6a8523f564c8b004cbeec883136/69736964485.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e0e175bf5839aaddaa7137705d997a6c/83007428437.pdfIn PDF document text
    • https://soechi.net/userfiles/file/13987984511.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/12055511359.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/wided.pdfIn PDF document text
    • http://szwygs.com/upload/lenoramejaxuxo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cc62qsnnfmq103o9d4um9065r0/lejoguxob.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/kedixuvozaraporuduneb.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/rsqb1vk60tbqd06gt5gmes3lb1/21417075679.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8b47ce58f---4645062533.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3675a6c96---soxip.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad43e66f33---31202902698.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///64195180099.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ll7g0ug1g07b40soist68vgqe1/33766611949.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/91459066129.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2980cfb216008066074e8f71760af7fa/fegasim.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_off0000c196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC196 10568 bytes
SHA-256: 9c963a5345072933084c93a7df76501b6ffc4889d450062b6413253ebc7a701d
font_01_sfnt_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 17612 bytes
SHA-256: 1da4965c8dca9bedd33cf40c3b8df045ea7b5bebb8022697ed1f15b3a5d53ab2
font_02_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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