Malicious PDF — malware analysis report

Static analysis result for SHA-256 9859af9c820a4f95…

MALICIOUS

PDF

89.8 KB Created: 2021-07-13 23:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae9dfbe15cd66e6e93bf7c03f6d13930 SHA-1: f8effa462816eb359a80a2b422fa3d401e07f464 SHA-256: 9859af9c820a4f95de59cb409ab2eea38fe1952b2f145445839ae693903f8d95
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=20+lb+stuffed+turkey+convection+cooking+time PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m8sqthm70aun29olld7nuk7644/zefeweb.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d0ba86c07---benugikigigiba.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l5n79dsr2lqad618oae0plula1/77322156107.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/43716644511.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/zixifu.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/97190421838.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nuruselon.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/48e9f61ffab013d7a6720c4e0282f098/sogit.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210618_3AEA6F7CE7A7C827.pdfIn PDF document text
    • https://egca.fr/userfiles/file/61774012051.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4d1637fb---46729357821.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d939ac4c9---9779647397.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/bexakonuxuzujuda.pdfIn PDF document text
    • https://avenue102.com/uploads/file/zajenixodesenikizi.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/52693970692.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a013e0d7e42---55303059753.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021062108001412.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbed6f37cc---88071369249.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f3fdea576f83be5fd5c479ab6d94040b/70335652409.pdfIn PDF document text
    • http://chinalabware.net/d/files/85684918236.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/tofam.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/6rlnmrten1d7lprln4ap1797u5/51639594114.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aadf3c3a7---zavotolegikiwigudibuwuw.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/82182685624.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/61762280851.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/c843dea8aae37ae5a49949f0115685d6/pibimagop.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_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 11316 bytes
SHA-256: 757f4d7e2980f13776c5c4ee3525722165b89db098c275e29d40d3e259492b71
font_01_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 17208 bytes
SHA-256: 2cfe8ccfb6315dd31b09f37781974e76e0be3fe504b655a7edc2630d5a426b20

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