Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ff933bb5fd9836…

MALICIOUS

PDF

69.8 KB Created: 2021-09-15 21:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9ffb19688a5dd881999b7afefa54e81f SHA-1: 8d3a8f2685eaf8c2f6c7f1c3484beeda9fd60fa1 SHA-256: 54ff933bb5fd98361f3c138186339806c61bb9285be4d02da9b00b1fbe1442a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to various domains, including compromised WordPress sites, likely to lure them into downloading further malware or engaging in phishing activities. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://inwebjor.ru/uplcv?utm_term=watch+the+little+things+2021+online+free PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f400fd2944---mijagugolepelewexu.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/bofipapezuxew.pdfIn PDF document text
    • http://ihdbd.org/upload/files/riponibixekubijirod.pdfIn PDF document text
    • http://isvpro.com/custom/files/gevedipevulu.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/26164525163.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/86458062688.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/rovorazuzola.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130acfa9f0c4---40308100311.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/zomamuz.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161362023087ad---gudobizusufuwu.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/wilulazoxerogonagele.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/67689676065.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/defumonemes.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/96344491246.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/gafuposalufe.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/zibojevupozax.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/zolujizot.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/35862683126.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/rizaguzaw.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/wezugozifinafip.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/namalugovesovejedovifoma.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/mezufu.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-15/20210915234451315419.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/79291489623.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/69334330366.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/aoi8vm679vpp77viedh59mmch5/39262749240.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_off0000b2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 10900 bytes
SHA-256: 339dd6acb04bbf47d7a49459bfaba3136abbac52061ec2b4a6603c71be38233b
font_02_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 14768 bytes
SHA-256: df425064d1170a5f58e97570559255fd53f25dc663366696aa505481063d8248