PDF malware analysis — malicious · 4c5d606817d278ce

MALICIOUS

PDF

102.1 KB Created: 2021-09-04 21:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 32ac3ab0480067358d98074d53c50d15 SHA-1: d542f739468238043dd1215fa5d8b96e7ba534e7 SHA-256: 4c5d606817d278ce710f1f41301959fa0d653833eacb8050b7191105658993de

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to external, potentially malicious content, which is a common tactic for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2b33fc9d---kewexigupusalamolaxu.pdf In PDF document text
- http://teerosy.com/ipp/images/uploads/files/22984641836.pdfIn PDF document text
- https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1da48c9ff---jofulenukutavosar.pdfIn PDF document text
- http://salamatekhanevadeh.ir/ckeditor/files/files/bawivejexafixowalimuduz.pdfIn PDF document text
- http://allivecoat.com/userData/board/file/84010294235.pdfIn PDF document text
- http://brooklynsmokeshops.com/admin/images/file/51941541000.pdfIn PDF document text
- http://svsteinfurth.de/radsportfiles/file/runovubikipuxafefepula.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b185c7efb---masuvudumotemagipitetewi.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/56260c0417f692a6037a364e4d133173/70585121665.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f42890018a9987b20f6738297cc32b6a/gupovowipilox.pdfIn PDF document text
- http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tipikorezixufonujumop.pdfIn PDF document text
- https://transit-connection.com/userfiles/files/91419991944.pdfIn PDF document text
- http://www.petercar0937494634.com/upload/img/files/1520368718.pdfIn PDF document text
- http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36658348874.pdfIn PDF document text
- http://jhdljz.com/userfiles/file/1630494947.pdfIn PDF document text
- http://neoneophytou.com/ckfinder/userfiles/files/mefukevitupajemu.pdfIn PDF document text
- http://fszhenjia.com/upfolder/e/files/20210730010015.pdfIn PDF document text
- https://eyetracking.pl/userfiles/file/wefakanuve.pdfIn PDF document text
- http://beachhigh65.com/clients/879402/File/21062304506.pdfIn PDF document text
- http://teraval.cz/res/file/wetofanez.pdfIn PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089195f6b6bb---6064757737.pdfIn PDF document text
- https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/67690972874.pdfIn PDF document text
- http://poltinka.ru/userfiles/file/48369143088.pdfIn PDF document text
- http://blesk-stroy.ru/userfiles/files/11073654809.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=classification+of+occupational+hazards+pdfPDF 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_off00012790.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12790	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00013fa2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FA2	19256 bytes
SHA-256: `b9ab1235212479db7d853544da0a1cf1b271b1342bb29c9ca0f3945183a8c69d`
`font_02_sfnt_off000171c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x171C6	10776 bytes
SHA-256: `086fa26a5a37ba191e1696124a754c19bba9c75399789eab503a6609871ef511`

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