PDF malware analysis — malicious · 6e1c874a97c80cd1

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 17:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: d30593e4e96e62ccac22b84ac5a9321e SHA-1: 35eb249e393dc450182d54cb4cfba410bbb44da8 SHA-256: 6e1c874a97c80cd1fca0e10bfe3065d6769753a4f6d90c3a68a1036bf8a173b0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or for SEO manipulation, as indicated by the 'utm_term' parameter in one of the URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9907

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://pistant.ru/uplcv?utm_term=2019+gmc+sierra+elevation+manual PDF link annotation
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160983884c53b1---vofekuwinelaxop.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09f6d793ec---gubefenefukokubojalejez.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc0212534---ragomoxawofujo.pdfIn PDF document text
- http://www.almansori-ye.com/almansorifiles/files/regukitepok.pdfIn PDF document text
- http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16100786880f02---86017934777.pdfIn PDF document text
- http://ottotech.center/userfiles/file/39538087842.pdfIn PDF document text
- http://aggengr.com/uploads/CMS/file/ziwemufemojoboxovukovazo.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b1c7306dc9b010e8f0371e7f56586ea8/22619550580.pdfIn PDF document text
- http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/80607110631.pdfIn PDF document text
- https://actaviaserica.org/board/file/files/filuvujaropu.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/pinawim.pdfIn PDF document text
- http://bhhangkhong.com/upload/images/files/vutadaxa.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/466ab824625e752eba415ee95b520ce6/60691785991.pdfIn PDF document text
- https://fruitssupplier.com/app/webroot/img/files/12828754952.pdfIn PDF document text
- https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/br9hhtte6hseh8oe3e1j9b6dfi/kinugobi.pdfIn PDF document text
- http://msamericapageant.com/clients/873634/File/59263620077.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607499a3e270f---22211408376.pdfIn PDF document text
- https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/55f6eeaf429e747f1278cb1516d6de6d/44231560952.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429042611621742.pdfIn PDF document text
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c714033f621---82253010785.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082028ab1746---bujazona.pdfIn PDF document text
- http://serting.eu/userfiles/files/95957975970.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5710dc065b---pilobijizoka.pdfIn PDF document text
- https://anjingliar2.com/contents//files/12774978747.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5e8290cb5---niwosoxok.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59126bd8d---63566414232.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ecacba4087d---63141204029.pdfIn PDF document text
- https://bilalyapidekorasyon.com/userfiles/file/bidosevuwisegilutomuje.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_off0000c250.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC250	15920 bytes
SHA-256: `1a843594d1b3172b25c0896848e567916bcd586d046b0407eb39e3c3623d9458`
`font_01_sfnt_off0000eac2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAC2	11104 bytes
SHA-256: `762d715c77039179df78858afa99f089eaa63e02d47249014c77b6e99ab9e4ff`
`font_02_sfnt_off000104c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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