PDF malware analysis — malicious · eb581334aa01cc64

MALICIOUS

PDF

91.0 KB Created: 2021-07-04 15:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 599f1155d8f2b559901288ab7471844d SHA-1: 38fb8003e330a47fd6e070cb1f79b78b0a733b57 SHA-256: eb581334aa01cc64b78df39339e824bc1fe82a9c8706cde5aa3973bde45ee3b5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute phishing or malware payloads. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate a strong intent to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6lvkmv0lk24u661om15dv5l2qt/22890161659.pdf In PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7666b18bf9---8521026594.pdfIn PDF document text
- http://xn--80ab1a9a.xn--p1ai/sadm_files/mijobemikijabuturonusa.pdfIn PDF document text
- http://otvorene-srdce.sk/userfiles/file/79827527036.pdfIn PDF document text
- http://thienlongadv.com/upload/files/wapesoseboto.pdfIn PDF document text
- https://driftwoodcc.com/userfiles/files/tuvamop.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607216adc4960---65669273639.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093a287bf262---17396760542.pdfIn PDF document text
- https://x-software.cz/data/file/foparidowusulodefonipav.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a997359628b---98989563155.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941337cacb2---6362246955.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/nuforedelatidipunodaxaso.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0hfi6apsoju58sn38l948sanf6/nasinakenesesipuvebadimub.pdfIn PDF document text
- https://secolink.sk/userfiles/file/65059652793.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95a645be7---83855981486.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b3a88fc7b9d6d5ee87afe60bb5cce034/ganaridebamajesibewin.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a567893eed7---77880608893.pdfIn PDF document text
- https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ca8235baf203b70503f2e796e420909f/83059516214.pdfIn PDF document text
- http://broorybulldogs.com/clients/33993/File/faboganelobizaj.pdfIn PDF document text
- http://leesfeest.nl/leesfeest/sites/default/files/file/2841943767.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa75b06c6dc---wibanuwovesuzid.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/091bd4c395d1c7e753a3e99c18321a5c/56148274482.pdfIn PDF document text
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nn7a04qc9cl5jdm4vkfdqmiel2/12935973899.pdfIn PDF document text
- http://agriturismofattorialucciano.it/ckfinder/userfiles/files/punada.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc2b70e46---42326827951.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=probability+and+random+processes+for+electrical+and+computer+engineers+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_off0000fc21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC21	11316 bytes
SHA-256: `608f8394fb2ad4202c8a8dd5905f0617c9442c0d41191d9e4d66c52557645747`
`font_01_sfnt_off0001164e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1164E	17964 bytes
SHA-256: `1993addf795492e093004fabe8eeb8f8c44737b133e701078c408d4adcfe454f`
`font_02_sfnt_off000145bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x145BB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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