Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbca67ea72a6b85…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 07:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 18995e668b6a0348e29253d12319009c SHA-1: 854267dfa3abf7be6f703a33b314a92704834776 SHA-256: bdbca67ea72a6b85af607b6f5eb2e9c2bcc89e60a0bbeefcebae42775f4d3632
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised or disposable domains. The presence of multiple external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule indicate a deliberate attempt to distribute content or potentially malware through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xlspandoek.nl/userfiles/file/posolenefoxalipobe.pdf In PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bd81c541555---vimineseg.pdfIn PDF document text
    • http://topas.lt/userfiles/file/zitejapurilu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ab4dd72ee7e5cbc37be4961f52687796/vemugigabe.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/luxuxetixopupidediso.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/13892634124.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160809aab93b52---bejuxopagazasudatij.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gidod.pdfIn PDF document text
    • https://actorconseil.com/files/file/fofesofife.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/4631443528.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210604_085014.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/78151232157.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/jevowujegazikerovukogi.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/tanisulefiwevatesebejil.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/orujqsq4j0mqhhosplnsuggpcv/tigebekumafipe.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0e251a1f---98728445167.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/tujopudeguporidiguruwode.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/99429005506.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5ce52092a---8641091735.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/92b29f40c0d5aff7e15d32d622c19bd5/xasulajunokafu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tntnbofgitk5qr7irecu3979ii/telugusobomenelozewi.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/20381131128.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210806173032.pdfIn PDF document text
    • https://masihpt1.com/contents//files/dadijudimuloledaxadulew.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/42798969674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=crickets+and+locustsPDF 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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 16932 bytes
SHA-256: e67cd547a325e94bc42b65f8ea448dbf25143571d6a8c3fae2e0583658ebd35b
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 10588 bytes
SHA-256: b800605b53efb446de9b142081c2de0ed2903d499644309a9b9a20b9f5ebdd1a
font_02_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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