Malicious PDF — malware analysis report

Static analysis result for SHA-256 f520d4e4bb976fba…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 22:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45f9a6734641cfc5463eadd7e44fe464 SHA-1: 7057246819a084d8e1e41213b0ddbbeaf71fc9f3 SHA-256: f520d4e4bb976fba6060317c3814a5fcd955bd1b908036a10a0e102a18645bbb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document's structure, with minimal text and a large image, aligns with common screenshot lures designed to obscure clickable elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://garglob.ru/uplcv?utm_term=100+endgames+you+must+know+workbook+pdf+download PDF link annotation
    • https://buyafranchise.org/files/files/venodavawuwulefekoperor.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/vawumexitofawir.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/20508614247.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/51341307243.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/50319541215.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/29726137701.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/dadibegonedezijana.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/dumitutuxaxepoba.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/1801686426.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2227810df---65914086947.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161376033b1a3a---28734149477.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/64166582710.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea3626701---mevaju.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/35613140372.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/56950803811.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/xakebax.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b2712c11---56850047965.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/vovujexulixofu.pdfIn PDF document text
    • https://davnosti.ru/upload/fojumag.pdfIn PDF document text
    • http://shophouse.info/images/files/2491842809.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/13120267430.pdfIn PDF document text
    • https://hot-pol.com/images/file/98936530471.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_off0000afc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC8 14532 bytes
SHA-256: 49e7648ad2b6f0ba5fc437d7584e365421de986f2462afa173cc745bd584deb9
font_01_sfnt_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 11360 bytes
SHA-256: 8532cd281a3a7a0ee60ee5e5e1a3aee63ef5b442fe4815c342e01127abcd3497
font_02_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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