Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b624475580292fe…

MALICIOUS

PDF

164.6 KB Created: 2021-07-28 03:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77050be797d5aa81222f4b32b2b453ca SHA-1: 0e71b4e7ba8adad7cbe93a2fdfd251ec0f239df4 SHA-256: 4b624475580292fe28e213674c1fd4c4f220232f88e138afdd249d1413e00fcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were directly extracted, the PDF structure and link farm indicate a likely intent to lure users to external malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9461

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 https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3e65ac02839a688d5bae0e1a69603444/nituwasojali.pdf In PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2300da6be---15554356928.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1lpmjm7crbtkcfooovespnb1i3/vabaxe.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb75345fe---30757382937.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/73222065718.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/388c7dfd7e61d38e4628e42255b38dd0/rufirudobukigupujosax.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/k20oqf9m1ei5uln1ig8otmifkn/zizivarafuxetabekitamu.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/nisapujiwuvolazilowipol.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/pijisuwifitobezi.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/55734437070.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/60402357049.pdfIn PDF document text
    • http://azizolace.cz/images/file/kekorepezevedunen.pdfIn PDF document text
    • http://ruihuitax.com/files/file/93911941564.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/dcfb4f6fe5343928cc1fde3432072e6f/vopivonawelolasafomepa.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/misetitim.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/sorodupexatijawupetenuver.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/1lcr8m6amcd55o9q8bkspme5b3/nusataxesutawawirit.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/gair9ad4qt68gu9c93rkp4i6mb/72243405751.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/038e9433854d7a2d3e7a67dca9a8eaa0/kazipibaliwi.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a251d9604c4---sapaxojitekofidunumexatu.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/75274238771.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607536be3159d---89546646690.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1c0e29baf5313ab57031420ee4126384/27009557889.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160919105b5bef---tuwekipurited.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=javier+ocampo+lopez+la+independencia+de+colombia+pdfPDF 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_off00021ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21ED5 10772 bytes
SHA-256: a78aa142c8d3c96166d079bc396dde9a7cd014ad65525382815417bd93523d55
font_01_sfnt_off00023764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F76 19212 bytes
SHA-256: 0edf359f4ed9bb838c066e08cf8e60cca3688fa23bfbfbe41531f046926b6a20

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