Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df9ca7bc0d90ed8…

MALICIOUS

PDF

72.4 KB Created: 2021-10-08 03:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f76aa78eaeedf952a7fb77cdf6c3f146 SHA-1: a14c7e359a773b59473f3b02054a71cf9631b25b SHA-256: 4df9ca7bc0d90ed85d5cff2fa96bb65258b8d06fa13467aa5088b0fc6d55e2fb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of multiple external URIs and link farm heuristics suggests the document is designed to redirect users to potentially harmful content, such as phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ketchas.ru/uplcv?utm_term=22re+manual+transmission+fluid+capacity PDF link annotation
    • https://textosolutionslinguistiques.com/upload/editor/file/pevasalimupedij.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/43593985225.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cdc829ad5bfba489ed99f1af20c748b9/lowifejerapinafe.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/94342997357.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/46086418961.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/78621021218.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/dobajapijimugokekivake.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109170944552070.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615cd7e3a9ce8---botamipib.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/balevopijerefa.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/72882194446.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210927110510_686151605.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/64708492945.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/pagedoxuzu.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/75582654064.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/33378726502.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/nexiwo.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/xutefige.pdfIn PDF document text
    • http://harlit.com/upfiles/file/bopokexogakarifabudufux.pdfIn PDF document text
    • https://etimes.mn/uploads/files/86785270711.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b47d3307fef1f9d00a91415778785940/kinedijelalukegev.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_off0000ba6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6C 15932 bytes
SHA-256: 7e1f323fcc9bf254d0a43a8db910e93686ef3990930b9f8d8943c6ab08614e3f
font_01_sfnt_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 11016 bytes
SHA-256: 063de0ef7e9d5a18cb4b6a015ba3804cd55bb3b2bcaec369d22deede325821c3
font_02_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1