Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1dd4ecb11b219e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 06:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70fd55d0349be95a4d8ead3339ebf75c SHA-1: d20d362b2c44c6b775f34cd1bec109d60a697a54 SHA-256: bd1dd4ecb11b219e7237ce1d05876636d4e5e157ed9510bcd905a0062efd193d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://infrive.ru/uplcv?utm_term=chord+hugo+m+scaler+manual PDF link annotation
    • https://djennebeads.com/nbloom/fckuploads/file/pesidijop.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210814190809.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/91a838a881fa962b6b383b8e20c67085/vuvupasazukagub.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/db1eee5dd1e9af0e15afe30b93c2760f/vinabimuvu.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/24196929612.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/fideluzonadozijirubuvijof.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/dupiwetaritisifopefajeme.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a375e353d7b---xuzavonukaxojigefiler.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f600e168d---solefoziwuwodunemikoj.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f71380b01ac---pamalipupasufe.pdfIn PDF document text
    • http://sakra.sk/storage/file/11039357293.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/3932480a88907b4d6316245e63d37f80/dodadawi.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/38978482727.pdfIn PDF document text
    • http://bakoca.hu/files/file/87826699542.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mds7vkameoscrdo5dfpqjnvv40/80382838911.pdfIn PDF document text
    • https://mimpidia.com/contents//files/3653515825.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/59604531283.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/xunefazuni.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210724144359_vk2ewv.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/gejotizodosuzotiludubero.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/27064174978.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vezisobijopefitolisen.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/loligoju.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/20616438381.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_off0000d372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 18060 bytes
SHA-256: 0225d663d4532265b0d1e6cd98873902b027e76ab764c91647e818299b0f4c0a
font_02_sfnt_off00011a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 10760 bytes
SHA-256: 65296a87c8e1ff6136fca007fdcb81e736ea83b27cb978451338ea317787bd3e

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