Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b518af0e824134b…

MALICIOUS

PDF

87.0 KB Created: 2021-07-20 17:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f5ab3c4bd8adbbfe4ea9ba45f1ea1665 SHA-1: ac4f2b2994e8032c4666d5f21c93ea8ea0264e65 SHA-256: 7b518af0e824134b0afa20efc798deba76543228f2cf8c93270cbe2d8a1e437d
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites, indicating a link farm or phishing lure. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting the PDF is used to redirect users to potentially malicious content hosted on compromised CMS platforms. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a29caf437---ledalozoloso.pdf In PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/rozigiderugifisobowageta.pdfIn PDF document text
    • http://www.celso.org/download/wofoxosobetalo.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/eu7v54rumrjgmem1elg5lgjdd6/kedazogi.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/78140864121.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/fumezagazirevaxilibim.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0816e1e0a770d765f72387198f43b063/jebobabuzi.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/64657258750.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/91be3395ac0037adbef8dc5b871dbbaa/62052546136.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/vudogu.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/kolejaxokisunufegexogiso.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/fujofujoguwelim.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/vukumefaviwirojafimuvef.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/mazobexogakaro.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/40808374528.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072fca5196f2---nenidelef.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a96d10ad---71812580753.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098415157e1c---63484391934.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/gufinewinije.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/61199997450.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/rubunakeweve.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607992da1cca7---pukaso.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/sekokanusinenes.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5e0747eb0b959a78e3841351e0007ee6/nisuvigepitavuditikiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=he+rules+of+attractionPDF 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_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 17304 bytes
SHA-256: 4ace46e3b85037e38feb822867560c31427dd46e2ae71e8c68d69b86c6f99874
font_01_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 10420 bytes
SHA-256: 5b2e47113c2a8a3cdc0b5c89af4fc4fd5c489f2daaea3b9184ef04c79159342c
font_02_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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