Malicious PDF — malware analysis report

Static analysis result for SHA-256 411680f3de59dde5…

MALICIOUS

PDF

80.9 KB Created: 2021-08-14 03:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 3083d4a7bb388e6faf46f3786252883a SHA-1: f1f5a9050482f4178e889464da969217aec3bfe2 SHA-256: 411680f3de59dde58690a8caf0041e8048d9bbcdbb16859d51b9d32475f1e126
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The file contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing campaign aiming to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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://autoroman-service.ro/imagini_ws/76762616976.pdf In PDF document text
    • http://riverside-plaza.com/upload/userfile/files/bamifeg.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a3867313a---92023653727.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/buxidoxiperekodef.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/25634330975.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/2c2e54b76e63316b80d04de89ab36142/4146055191.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/68795269009.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/17986543013.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/10140563910.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/nuver.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/32638599890.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/14273769577.pdfIn PDF document text
    • https://puppometalli.eu/file/fejonoxilutesulex.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb1324b3e6---wosabe.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/pewutoke.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/72341422336.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/bobetagixefomelon.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/jabivuvuxosinu.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/97895684843.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/37854433334.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fade2c63bc---rawesajisoladifitoj.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160716bc1e537d---12663973012.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/65728332952.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/milimilezimevelijokabuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=caravan+encyclopedia+of+general+knowledge+pdf+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 17056 bytes
SHA-256: 4e2f1a531eeaf5f29dc751385bedae56d953a9859f426efb0b93f6c4ad1081f5
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 10916 bytes
SHA-256: 639922639f34f232cd92b9342d69baf584553d39c0a6f9b040486230aabf1d24
font_02_sfnt_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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