Malicious PDF — malware analysis report

Static analysis result for SHA-256 0881770ea9d13d46…

MALICIOUS

PDF

76.0 KB Created: 2021-10-13 02:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0bfbc0e7c6890156fefd096cfd5d7c42 SHA-1: 039ecb02a1da0ec6939e09844efe3b5cf979906c SHA-256: 0881770ea9d13d46b67d41ea66276acf9ff2600fe4f98c349ba6cf548d851d7a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings suggest the primary function is to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.champagne-cornevin.fr/ckfinder/userfiles/files/86053389402.pdf In PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/99653610185.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc5288d5c---90839284344.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/dofomofegitonupusuzam.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-18/20210918152849997496.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/rafetopa.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161654c66a6902---fafuwuluburu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9d6a1001c2fdb4150510cfc92b174057/1932362317.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/8215682219.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/jawedapomiwisojix.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/musalofad.pdfIn PDF document text
    • https://makenie.com/upload/files/35741031379.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/gesuderexurunenawo.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/67131012648.pdfIn PDF document text
    • http://client.diffuse.info/files/fakubiwoxivojibuw.pdfIn PDF document text
    • http://esejsc.com/upload/files/48943607400.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16165a2772a0dd---junagisusamewuxowukunim.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109201845222616.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/lolabolozudesavuwibepe.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/72809540907.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9e5b9ae59gmbmco9ho85a2nqjm/jupejekawituzegisunaruxot.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/nojusitowajowoxeb.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/wekepeze.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/u-9XGpgKpwY/uplcv?utm_term=section+and+elevation+drawingsPDF 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_off0000c74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74E 10772 bytes
SHA-256: 070a64d70627ea30b6b5432239b2c7276444ef8b09a5ba4cac5d7095359aed0c
font_01_sfnt_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 16632 bytes
SHA-256: c5a08e75e6fc4c65ac837c021d3bf7af6fd7e30895c2f9c19f8a017cab074674
font_02_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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