Malicious PDF — malware analysis report

Static analysis result for SHA-256 454b52367dcde44f…

MALICIOUS

PDF

88.5 KB Created: 2021-07-27 14:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ee19602b576019193bb0a1c88ca54b4 SHA-1: 23d1ef5357a5a1862b45571bea3208d8c5cc78de SHA-256: 454b52367dcde44f6c025807759456a2eca691c24cb3c375c6a4f40acbb1b26c
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is used as a lure, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://starbox.fr/img/files/58959476460.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a16788739ae---51404696254.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3a4a1371a49d5fa6ac1bc110ae05ef5a/31995008616.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/96db916453378218b9225769abf4e3b7/50462920866.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4cdceb6cbe628bcae5e570c85870ed0d/teguzowubosupukoruzavudu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083b16ea6e3b---45590301081.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e324401a89---padaxanawaravorixib.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/57906859473.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/b9703674c0601de47d61c5bc36a6cfec/14843422914.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210508071723173.pdfIn PDF document text
    • https://dintek.eu/uploads/file/jakekari.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/35617359188.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/72c06e87916e48c80e257f7613747dbe/9097489822.pdfIn PDF document text
    • https://irantruck.ir/data/file/84838223074.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///losatulitezimukizufuz.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/jemiwirisutebalaxag.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/webirodif.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/6e2u5ejqu8rltrtbu3hpococrg/33939904295.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gujikijuritusovajepegu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7121e671c---xaganepirurifef.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a445f89888---lamesuzipafadiruvovurukom.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a9dff13b7---galanujomivolefigasejovu.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///pejigo.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/xebamofov.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3433a435d3---tofozufexisiviti.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/dozexijegazop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=herpes+zoster+treatment+guidelines+cdcPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/20518947793.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/1700559129.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_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 17148 bytes
SHA-256: 1683cd6c5bdcaefd16f5443343253e8f51f1e94a8d1fb3769e6be024bf2a1065
font_01_sfnt_off000122cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE6 11008 bytes
SHA-256: c49dab960a290f65940d98f6f5b8ae25048b7928032e8d38b4eea3babee7ec0b

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