Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d38786a69bd3185…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 14:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dda86dcb397851970abf43a54c4de6d5 SHA-1: 954cd1cfe2b4ba4831d0cff204fdccd165930bc0 SHA-256: 2d38786a69bd31854c5e9dcae3927a4ef54436e6cfbca3303db8ffbc59ab2028
196 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social engineering tactic to prompt the user to install malicious software or extensions. While no scripts were directly extracted, the presence of numerous external links, some pointing to potentially compromised sites, indicates a downloader or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/14480686886.pdf In PDF document text
    • http://yuh-tarng.com/userfiles/file/11635017915.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/41048743784.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/vilusopozaposiroxisasetub.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0f7b9b51---nazuliwanugorilofolewara.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/tunesorabipapojexonuzejek.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kofuderul.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5707ec79c2e1064ea73c649f7a13fb7d/10540665438.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/17827048024.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/43650167992.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/68458072593.pdfIn PDF document text
    • https://denimder.org/resimler/files/81735542063.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/8506646801.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b73bde1d0---webitovazotavixexamidike.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210903_142000.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/25412656947.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/c26fp5on0n91gkv03p4avjenie/92357561490.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/88894437205.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/53479444518.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109090510170407522jg6p6bxo3ov.pdfIn PDF document text
    • http://synphabase.ch/upload/file/53346103741.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/59478870272.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16304976428d7ce85fcfe945df787.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/9780122844.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/vugarotawurule.pdfIn PDF document text
    • http://preiss.at/upload_files/files/41127049918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cookies+on+chrome+androidPDF 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_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 17568 bytes
SHA-256: d590a5802d2bda08113dbd3e25bb6e2b9d08778d1a61e77408e894640ec4da9a
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 10612 bytes
SHA-256: bb99cfd26d141df0b41d046fd51d736dd9e6e5b6d0dce07d889dbc7e4dd2003e
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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