Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb16e6412b44a9b…

MALICIOUS

PDF

75.3 KB Created: 2021-06-26 16:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: addac8f7758be34cff7acd1f80ccd750 SHA-1: 08eb77e7e6ed3a0c17688dbdbac654ce7f6ed9aa SHA-256: ebb16e6412b44a9b1014cd9b20e72da9e74e66e79458cd201fdc455cf73bf184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://infrive.ru/uplcv?utm_term=lean+on+me+by+bill+withers+mp3+download PDF link annotation
    • http://reikihaus.com/clients/75291/File/faverowof.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa4c122aa---89896807981.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/biwukuzozu.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/da48e6dd843fd4ffc8e93900bd2a7fe3/muleremuf.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d00c5633b7b---1652247126.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608874798cb93---rizaralinenavizutuki.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/noxutemiwamikit.pdfIn PDF document text
    • http://talleresjpg.es/img/file/70592804913.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ptecrpevmn9ggmhoqoj30nhsa4/88459802908.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/zevolafoxokizurotozafe.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/mopawaletofunizivoma.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lupuneluzoridazup.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/nixejerazid.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/dirugoxutifoganegi.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160772089ec541---wazibolugedubagugin.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf3655a94---77525578454.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b28028e3194---2539447501.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7c7830c5413bf494b8295cdbd32f327e/xarasunojosudi.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/4143449955.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/fbfe456c5ef3365dc5a1dd53166b2ed4/55244660214.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/zufebasikolasit.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607048dd6bf0f---60127163470.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_off0000bf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF22 11128 bytes
SHA-256: 1b736f87b898c89067bdc60e001d5fc4f1eaac9fa3ec766101bce1177254956e
font_01_sfnt_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 17500 bytes
SHA-256: c071a5a65f2acb603ca8376917c0c67d424842fcc7e8be4099bf84764e4a094b
font_02_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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