Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca88b7b595b9119d…

MALICIOUS

PDF

91.9 KB Created: 2021-06-26 19:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afded47e339e353b4ae0db401cbb9db5 SHA-1: fa7a50e3a24e04c1688f5cd635c1d4713f845118 SHA-256: ca88b7b595b9119d50644c79f1e8f10ba2f55dadb55555bb516daa95eda0baab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=the+reconciling+item+in+a+bank+reconciliation+that+will+result PDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b46d1ded3c7038206669b712d573636d/26438606577.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/pefozupu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c7239af5ab2afeb8915684ffb0c94c33/mojononuf.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16075d02acc74a---vigavegubitus.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/baxipepafivoz.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/vokapekoxukiranef.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/biwanibulesevinidafomu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kkp9v2jc5495qljmfpgpof0tj2/97737911282.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/qm4lvckc7eqlakjhb881b06jhn/49183247913.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4c93o1i5a6ueb43j260j29t1e6/wixazesudibanololexi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/pq03f5o35ci93m6iag39ti2hpj/10439042930.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b518feaf462---55307023242.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/satetarabejazu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2f4e0ce689bf7c1a4f2e377b8917901f/dozejefolovevowaguwazasa.pdfIn PDF document text
    • https://tessuno.com/upload/files/60cf39c330747.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c374f7cc---dorasa.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/81874057572.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccddbc5e889---58468150262.pdfIn PDF document text
    • http://zivotzaokny.eu/res/file/86368967537.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ua9v98ed23d2t13b79i8c0u29e/3151306482.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/11658219426.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3a879b80ff60323377931a44d3fb4019/88421823056.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942718104cd---witesoxubebememotutonaz.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edab024e2---rosunomixebononunemetibuf.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_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 11060 bytes
SHA-256: 17616096342d14b1c8fdf60b602beed3909501d0bb5ddaa54c865691a5c60195
font_02_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 17340 bytes
SHA-256: fdc81410316f2a14311bada2eb59dd18990063ece47b8138ade1fc64bae11e64

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