PDF malware analysis — malicious · e43e884f866e92fc

MALICIOUS

PDF

191.7 KB Created: 2021-07-22 07:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 23a50efa0c2750a018d82cc084561717 SHA-1: b371198dd0ab489a8bae11da574edd3e08cba332 SHA-256: e43e884f866e92fcca4493a3dd240a516421cd258a92d58e73eb9803dd9213c4

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, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised WordPress upload locations and other disposable hosting sites, which are commonly used for phishing or distributing further malware. The presence of embedded URLs and the overall structure suggest an attempt to exploit users through deceptive links.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://proia.bg/userfiles/file/vuxudososux.pdf In PDF document text
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/70f66c060890b687c5cfca7c4a955838/zutesitugi.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e1aabaa5---93156804725.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b34f096cc50---3723948112.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c60d6805f---barokugexawug.pdfIn PDF document text
- https://dewalt-naradi.cz/media/upload/editor/file/rikokivumelavorupuv.pdfIn PDF document text
- http://uk-finansist.ru/userfiles/file/kidafidugabasafel.pdfIn PDF document text
- https://people11people.gr/uploads/File/tawuwegofopotavesiwopam.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/bkipitndv9jb320beu32illtjr/16384989237.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5e4f06d8cdb13ff11675dcf9795425fb/xurotegigaxumomufi.pdfIn PDF document text
- https://ctsgroups.asia/images/file/76901765123.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fb009f958---95504157593.pdfIn PDF document text
- https://mysilo.com/upload/ckfinder/files/penajusos.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a3ff31c6ce6551aff225a4a220d5d9fb/difovovuxebokojekepiwoz.pdfIn PDF document text
- http://www.mezmat.ru/ckfinder/userfiles/files/nuzativuladowomal.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748c6b9faf3---780050377.pdfIn PDF document text
- https://boucherienabli.com/uploads/FCK_files/file/45874013359.pdfIn PDF document text
- http://autosoftware.company/autoresponders_images/files/sesavudavojawulebemogafer.pdfIn PDF document text
- https://aedwea.com/upload/foto/53037670251.pdfIn PDF document text
- http://villapellegrino.it/userfiles/files/42217346617.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/45bab0a02806c124d6124544c418ef02/sudaxokeniriv.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096f7bd4ac61---84144644475.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8f5b9b7a77bc1e6a2cc852f333ed9db1/29783218065.pdfIn PDF document text
- https://penal-garazh.ru/files/didukimagekel.pdfIn PDF document text
- http://pr-jam.com/ckfinder/userfiles/files/17963831074.pdfIn PDF document text
- http://alacarte-grafik.de/userfiles/file/31725423677.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cc3ca267e84019a158e2da1b2aa80ac/lowura.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f05281ff---bezuwobopanigujo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=linda+perry+songwriterPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off00028ea7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x28EA7	19504 bytes
SHA-256: `9c1e5058618f4cc7b7dda62e457869d26b784a3d00d9ccac91d03f734e606351`
`font_01_sfnt_off0002c0a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2C0A3	10680 bytes
SHA-256: `3263f1b008dc725f258cbc7865e05f0be9eb21c02d2e6b08091a80d8b2da535e`
`font_02_sfnt_off0002d919.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2D919	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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