Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cacb53e1be29fdf…

MALICIOUS

PDF

87.9 KB Created: 2021-07-20 22:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2133a9daece5bb4f60d2e6023ba63d77 SHA-1: 66f7b416c432b8bb90e930acf10a843ea7cffcc1 SHA-256: 4cacb53e1be29fdf34537839e19c1173476a62ecd85f11f8e7c6c84e45d2a6ff
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 pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to host malicious content or redirect users. The presence of these links and the overall structure indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ajwatravel.com/wheelmarine/userfiles/file/86251909260.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/831mut2r672ojsf3gimcmad5lj/bilujifaf.pdf
    • http://hodinovysoused.cz/upload/file/donexekonekariga.pdf
    • http://pressvaluation.net/userfiles/file/jarufiperixirojiroxokigo.pdf
    • http://geometrarontani.it/userfiles/files/tifilabosekegas.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc1e30ef73---guwimalatigodosagatix.pdf
    • http://gelikonline.ru/content/Files/davujowidibux.pdf
    • https://coolinterier.sk/upload/files/60157887313.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607656895de04---51617901057.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/xesiwilimukalorexizipomo.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f594ec805c---41534913467.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ihabb5kn5g6eqoa5q5nk06gnhp/8476035696.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hjadscadsbh95oq5mic2jpjkn3/maxadepa.pdf
    • http://uptownherndon.com/uploads/files/11632107287.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///91794872635.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a11f021a3155dc223ecdf242dca208c7/vazidus.pdf
    • http://akinmedikal.com/uploads/file/sisekilaxogasezagutop.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/91788063968.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c870d2072ced1ce9424a53da2e8a156f/4577444119.pdf
    • https://chpcentre.com/files/file/84177149544.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2bc3f8a101fcb0c1dfceb76d04749e67/zixosemosololapovu.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd4fe55844---21096106938.pdf
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/namonavufikotapejub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cavernous+sinus+thrombosis+definition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3dd.bin
0b04a9543909cd42d2ef4fd0ac809458bc5821035b7210c4797325d1fe38a096
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 17224 bytes
font_01_sfnt_off0001212a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 16792 bytes
font_02_sfnt_off00013941.bin
590c8e7f20259ed9d93409e77b5ccdf186e2d364e614fff0a024fd64c34744cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13941 10912 bytes