Malicious PDF — malware analysis report

Static analysis result for SHA-256 149112eb6a0ce658…

MALICIOUS

PDF

87.2 KB Created: 2021-08-19 03:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8de614022d5f0dffd32b3cb2aeab080f SHA-1: 2e97b7bd34dea83c5875fd3590098e5c47692d7c SHA-256: 149112eb6a0ce658e72e3004b2e5824ea4ea575308731d1b4502aecfa5d1f120
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. The document body is heavily obfuscated and unreadable, suggesting its primary purpose is to redirect users to malicious URLs rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://kimhoatra.vn/upload/fckimagesfile/pofujidoget.pdf In PDF document text
    • http://teraval.cz/res/file/68252594583.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3bf8hktj6tmmu099g6em395pvk/kevel.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/39d7285a8f12bd933ae9af711658a8ad/somobapulepufewinokol.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4d2339e121bf71f94b785c65160716ec/xesaluwojulawowu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2147675ba---86277306736.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7cfde06ab2bd774571ca1ef1b59abc5c/23320874437.pdfIn PDF document text
    • https://ubranni.com/uploader/files/6844724273.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/23/file/2126026838.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c8ee1591---41686618675.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/16492995792.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04e722ab49---zopanuruxomopude.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/14809563417.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bh0kj436kici26hg2fkka5lkn1/69855970843.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089a19d27d94---16146051218.pdfIn PDF document text
    • https://norservis.info/files/files/17778110349.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/dijananafisedav.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/gesiworogovamipaxefotaxu.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/99897014193.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118ce0d5a56d---zutodu.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/672cdc48294be8cb5f5619309ceb44d8/23012495084.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3436f0a058c0817b2f40c6ad9ff89d55/39030271722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=we+ve+got+the+power+lyrics+and+chordsPDF 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_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 11052 bytes
SHA-256: c3cfef6c020d4f35d7765e8719b11f8e09803f058e63767885e0e67a5c8820f3
font_01_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 17224 bytes
SHA-256: b257b617623dd4e109880894fdf42ddec3600d2562ce3ed2c1b56944a23879df
font_02_sfnt_off0001370d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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