PDF malware analysis — malicious · f5068d1bd8ba3a65

MALICIOUS

PDF

109.8 KB Created: 2021-07-07 11:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 44b3669360b390e7a014637e37484d68 SHA-1: 5ab91a916b49ae713624e7c5441f48d6e6c045ac SHA-256: f5068d1bd8ba3a655ec14826cf7c95c0ed2db4d12b04dd354d65255cf6783abc

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to host malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with a phishing or malware distribution lure. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9794

Heuristics 5

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://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/4e5b95ac8ea836262475cb251ef77d1a/xetuluvezadelafu.pdf In PDF document text
- https://leosservices.com/userfiles/file/metoxugaweronofebi.pdfIn PDF document text
- http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c33ae74e1---49167770205.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3db6e3892---gixeraz.pdfIn PDF document text
- https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/toi60reom6eq6miadup993oi96/nezewimoba.pdfIn PDF document text
- http://vervesimuhub.com/userfiles/file/89369769962.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/gigidarakabolevomozub.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160713cc43b85e---31448390510.pdfIn PDF document text
- http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lmkt1mef4negk376llsaehi077/baletorasudulesepuxed.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32d0539d95---25010483360.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98b9585b49---58297748351.pdfIn PDF document text
- http://aldo-ins.com/userfiles/file/27260410282.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de352b229---5227084943.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/082a926cba50c2649adaf8148cd83a31/pukotafawaxutidigosiz.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e6bf33458---wudunugidepupigariguneji.pdfIn PDF document text
- http://okuninka-biale.pl/userfiles/file/38610766125.pdfIn PDF document text
- http://championshipsportsrings.com/clients/23492/File/wadurobesukazedaxe.pdfIn PDF document text
- http://satisfytech.com/ck/upload/files/22164487776.pdfIn PDF document text
- http://nuocmambason.com/upload/fckimagesfile/5ed4a383e74640304592a3aa8d973d0c.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15a8a6760---xuvabaselovuxajuwopawipoj.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5ed5a063aa0804d6e2b584f69a7ae295/vosipoxagodidojunow.pdfIn PDF document text
- https://aimhc.com/userfiles/file/mazokupope.pdfIn PDF document text
- http://skonasystems.com/userfiles/file/93815231764.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfefd6505d---sumurixomowo.pdfIn PDF document text
- https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/o0do1rnrdbqieap4i0h1of84b9/renafufojorapalefupo.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/l7i4mbrstrufiah87n9uca2sd2/tugobapevevujibibuveta.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=annals+of+forest+research+impact+factorPDF 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_off000147ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x147AD	20280 bytes
SHA-256: `a5efa781f9c571fa13435aa88ffd309e89608ded50fdaa5bf5390927c97748d8`
`font_01_sfnt_off00017912.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17912	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00019129.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19129	10724 bytes
SHA-256: `a2124ffa994eb04a47733ed160d172911945b8788a2a9997f40ee48a45285ad9`

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