Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b8376bcf95e346…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 01:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 496a71aa7313b479506007fbd913a4e9 SHA-1: 04f3e14b3e8b957693fed03d24fd09f33f2e54cc SHA-256: 19b8376bcf95e34614994bf811afba95df3ca42f9d19cc858a7891adf4ba775e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://canxetaidientu.com/images/file/butefigobotatesubufad.pdf In PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/zusatiturifazajenamabeju.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/nasirofagipop.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/fudojojovisitemojimuvupe.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/majike.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210709_B3FADCA6FED47DB4.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/30236507240.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/pesedafupebiliduxaxa.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944bfad8cc4---38585715051.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/84446893655.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/vuxetukukilawajajimoku.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/25261930021.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/befurujikanefovupuz.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052510381950.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/nakokekemonakedegitozab.pdfIn PDF document text
    • http://abroadster.com/files/1426966321.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/61837350743.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/29694082954.pdfIn PDF document text
    • https://best-label.com/upload/files/momifagilanubido.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1b1854c8263398efebf950fc3da5c980/25096838288.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/423ae66674a3d48c63bbcdeb0daa3746/suximidu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e6dbded6de4a96bcb8deaa6ea8397b90/83247986284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=comprehensions+for+grade+6PDF 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_off0000cb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB49 17792 bytes
SHA-256: 7321d0d737cd83d90ffdeb5d2a9cf24627891ecbaf422c5d4025eb4d479f0585
font_01_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 11000 bytes
SHA-256: 3ba2103f24a4c3cf9cd9e15244a935f5e0d64c7abe32ece8e54ac9f6dd3ce72f
font_02_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1