Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3e08b02db6ecc1…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 16:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6c2e7c5b079a729541f4310ff06a3fa9 SHA-1: 6ab72f559380afea98b40ca7f04f5b9e3c94dfdf SHA-256: 6d3e08b02db6ecc1822483dc0da3216c3412fb27c4dfecc00f1ad8d85d4f0e81
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, leveraging the PDF as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.pranabkumar.com/fckimages/file/36550850430.pdf In PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/9ndsgjfnqa3vncd8akqv6jv9mb/kilofobubodumonisowa.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/jibetajurojubatus.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/335vgt1q7659lt4soli63og4fb/88328002846.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089581bc5964---pofujosoliwuwarariredozug.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd6b5b26a---94120386107.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/zepusizatijevujuguwoze.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/8071507631.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/69576607904.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071677c95ed0---97792579273.pdfIn PDF document text
    • http://koala-al.com/d/files/jodisujini.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/mapodagavowuzetod.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072320861918---jaxalofexufoduk.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/fotebafolopizeji.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/25576725866.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210627_9EB9C9DAC78D9C8C.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e6q37iio16ddstuudgnbnft586/76545075114.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab93c6449---mugipojuvumidar.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/49355162130.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/teluwibunesumotowe.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16090750e8820b---82474734023.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/52289d93827561e2b08c4f8c10c0435c/22804397093.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/73aa8e690cfd19a4a25c79ac04dff395/12693869184.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/kopopelitipixelidamikozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=get+up+toPDF 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_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 29064 bytes
SHA-256: dd79867f67e3ba86e895e8a7071485e633574683f2cc97e1d05bde6422120d9c
font_01_sfnt_off00011caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 9712 bytes
SHA-256: 4f4b2050d2795b6e5b8a8e17d4f664b0d70acecb8b7ec6628390210d9e115491
font_02_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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