Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac287a3bf0f3de5…

MALICIOUS

PDF

81.6 KB Created: 2021-06-28 20:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1e22be030f8b135a1ac7aaa53cc4e8c SHA-1: 8860a560f069b8126c4dd55536712f49d747a507 SHA-256: fac287a3bf0f3de5b4f5e36206d9929b65a4eb628e0ca061afa4e61ab6b4bfe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the heuristic firings and URL analysis point to a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://petra-dario.info/upload/datoteke/lizomijigivomufez.pdf In PDF document text
    • https://people11people.com/uploads/File/ziwetebin.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f5369ac7243d67cc1c4b6005fd2a3e0b/bidekodaveniwavum.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ac06820c---4914745573.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f034576dff---vepirudukozufuwesosev.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/tularumugofijivag.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/rugolijuzuvixisu.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/96604573923.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vulexexizanovudufikiwunel.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e855a02b11b9e4ff70666e91db508ed2/34119660559.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/76322636892.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/94919306726.pdfIn PDF document text
    • http://come2menorca.com/images/file/86524729997.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/77341049728.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/84033027572.pdfIn PDF document text
    • https://kalewebsatis.com/calisma2/files/uploads/72205620990.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/93318850966.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/37rs8ml7c1h0ei8dfceuemvt0v/26439639389.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e919cf49---94364948681.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/c82loc5mp9d0q0d7assav4vdom/raduzopoxetikapavibiwidaz.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/kopilifirugejexevi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/p95b0nhcu6i98orr82mfsvm4i1/gogefujeb.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160891eba0634f---zavikaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=common+law+usaPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/734839024353b0f782f4bfc6f08af1e0/sudadiwikirati.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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 10064 bytes
SHA-256: 15dd5d6e7ad2d992413ad5679e1af0d7164b21ae0c65cacdec8aab83eded7651
font_01_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 16880 bytes
SHA-256: 9acf65a11b1584a8b0242b27eba0d986dfe34c4b17eaca7cc0dbcd9122ad6a30
font_02_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1