PDF malware analysis — malicious · 6af4c00ad43dfb56

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 12:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 20b467f66a8ef6e94996419e16a90154 SHA-1: ce701d68d740d4b89dc4bd4994d9b9fd0b81b9d1 SHA-256: 6af4c00ad43dfb5687d56a55787cd6ef2baff5a6c5cb4682732dea747e4f3f37

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to websites, many of which appear to be compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign aimed at driving traffic to these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://chcial.ru/uplcv?utm_term=take+out+thanksgiving+dinner+2020 PDF link annotation
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d523ff3285---99961344355.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5d604e3c8---wuruwabedazumipudox.pdfIn PDF document text
- http://cga82.com/admin/File/90140443625.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c2105444---1599702394.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/a3em2b512h8e1j4vb63i27s2l7/guzovefasogesuwo.pdfIn PDF document text
- https://horizontire.com/userfiles/file/jezagon.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc7e229bf---63000190501.pdfIn PDF document text
- https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c539780aa949e83c0a7a9600fe5380a/melexumiram.pdfIn PDF document text
- http://ural-kip.ru/admin/ckfinder/userfiles/files/vujunuvedesonunefamun.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e769e2e066---46026519913.pdfIn PDF document text
- http://longarmacademy.net/fckeditor/userfiles/file/72518944435.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097b5b627360---11829486492.pdfIn PDF document text
- https://aashianarealty.com/file/14494696304.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c569e83705b---16683227878.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/55c349190a463f371d7100a579bed8b4/86248685179.pdfIn PDF document text
- https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a18dcba9e96da44e87c67d06a679e24f/52734006234.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2baolaor7vat7u8220tm9920o6/zidemefarewojisubenubifiz.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16099e6c899324---vesivijim.pdfIn PDF document text
- http://orosweb.hu/ckfinder/userfiles/files/zezoxuwinipelijirixugu.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e205021ace---volalixasekoranisonirudo.pdfIn PDF document text
- https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0bda6036b---36271134077.pdfIn PDF document text
- http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2a4g1s2lc49knl372jpm6n77o4/97274855011.pdfIn PDF document text
- https://hometeamcorp.com/images/usr/molejevobutejerixe.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a504b405559---1926850983.pdfIn PDF document text
- 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_off0000f92f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF92F	10944 bytes
SHA-256: `d38b6f89cac0b67a8da17871e930877fded36501845e66fde2bae74c67f9eb30`
`font_01_sfnt_off0001126e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1126E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012a80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A80	16280 bytes
SHA-256: `8bc071baafcc684cf56018d6a709745034dfb240872ec60bd09e384b7b169817`

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