Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5f9f1d7350d6a8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 07:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48b631f1d3e0d937d8ab6839ed02f5a5 SHA-1: 7bffe9e32a394e24a72ec4bbfcfc3a58d870a084 SHA-256: 8c5f9f1d7350d6a8225b6c2a5e1390dc0e1f9117e14d109193d44ada8fc2c9c6
204 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing browser extensions or updates. While no scripts were directly extracted, the presence of numerous unknown URLs suggests it may download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tabularasa.lv/sites/tabularasa/uploads/documents/files/ninifuluparikonigadolulo.pdf In PDF document text
    • http://abpaluso.com/upload/file/baviremigel.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/48673677471.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/36222890537.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/28680370680.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8038c4cab---jagokotogaredubuxuzose.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/8330099732.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4cc80336d76c7c08b7ca5d30dea56601/3421627965.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a6254b27---20980730982.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91174c96ce---jogawugarosisege.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/84870428933.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/07eba5963a34767cbc9ac8b8b32a3834/zivit.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/xanam.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160940685523f2---lidegelor.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/rekovu.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/42026847739.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/93765165455.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/43614167430.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c137b3314f9---55912276895.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfebf174dd7---31246898485.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/60363648492.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/fugezewefexokufivudiroka.pdfIn PDF document text
    • http://dakmet.pl/upload/ruvalakati.pdfIn PDF document text
    • https://businesslife.com/content/files/kajuzawegejumebawawupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=convertidor+de+pdf+a+jpg+smallpdfPDF 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_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 18400 bytes
SHA-256: a3eebbe708e86c9adde24c20fc8cabe58f6b368c2a397049290ac60f5aa38d04
font_02_sfnt_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 11068 bytes
SHA-256: b944d048e7f388a23df6c001aa9edddbf19e680c4b67e7c6ddd56c2d5c5d44ea

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