Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89540840ac7a146…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 01:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc4badf209d85245575347ccda968b43 SHA-1: 80db29996d8e29f2046942ef7506074cd114df9b SHA-256: b89540840ac7a146a913f1ed5d5ecb2fc2b2cb14796b93ef4b0e8c3a7e065d07
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous URLs hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term=disable+android+camera' in one URL hints at a potential lure related to device security or privacy settings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://artecgroupservices.com/imagenes/file/20079490624.pdf In PDF document text
    • http://emaaravm.net/upload/files/3033605598.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/peligewivutamesizuderak.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/38165909669.pdfIn PDF document text
    • http://lejonhund.com/upload/xigibuv.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/74917415618.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1f9dbf39---58703127211.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134868bd5751---36139432663.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/xupivenupav.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf54c5dd0e---69225680562.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/jipokidumojukizopupub.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210905_91F804A83B1AC5A7.pdfIn PDF document text
    • https://12shio1.com/contents/files/nokefutipolonobopona.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/rezujetelovixovix.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/14171811305.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/bujisitigojeduvovi.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/nibiboxazalo.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/xezinozudugedokob.pdfIn PDF document text
    • https://redac.ch/upload/dunerutode.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/gebujet.pdfIn PDF document text
    • http://minhanh.com/files/45732161609.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2270c7da---likijuboduxip.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/xedezevitivepawojufevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=disable+android+cameraPDF 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_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 18228 bytes
SHA-256: 457eecbcd4bb1942a8c56fed2e88bf43f1dffb838b1ea99efb91209f9dee246d
font_02_sfnt_off000128f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F8 10572 bytes
SHA-256: d12928fa968134982a9d2df7c80126e58119f169ca68e6221f5da8bb5f8dd243

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