PDF malware analysis — malicious · 5bf79eff85bfd981

MALICIOUS

PDF

75.7 KB Created: 2021-08-23 11:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 64bee7e18545eb0523ecf5c977b387bd SHA-1: 93f7f367b6fb1e16cb84110e523f4a79562797ce SHA-256: 5bf79eff85bfd981dd1afc1a407b23b6db1dab2caeef77dca77c1fad1d04fe8d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely leading to credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=numbers+that+have+an+odd+number+of+factors+are+called PDF link annotation
- https://konteshamamotu.com/userfiles/file/909597647.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63309baa3---96042420631.pdfIn PDF document text
- http://udmvdpo.ru/images/files/baxuvexunodivanedulapina.pdfIn PDF document text
- https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6add92c2b71df42683d1164b5879b056/xamosusapujagosew.pdfIn PDF document text
- https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa26258c567---96566721253.pdfIn PDF document text
- http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/96681215190.pdfIn PDF document text
- http://apricomm.com/userData/board/file/wusoxi.pdfIn PDF document text
- http://davisnewfoundlandfamilyreunion.com/clients/60627/File/85125448068.pdfIn PDF document text
- http://soyaksiesta3.com/userfiles/file/vupowovapazogudedetige.pdfIn PDF document text
- https://aspaeng.com/files/image/files/90495186186.pdfIn PDF document text
- http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6h1j652rdkimgfbsc3q6csq372/pezegoxupafekumonil.pdfIn PDF document text
- http://anhuicrew.com/upload_fck/file/2021-4-30/20210430080554555642.pdfIn PDF document text
- http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/62223314913.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075867ec10dd---12509186558.pdfIn PDF document text
- http://yuanyoujie.vip/userfiles/file/jofewusol.pdfIn PDF document text
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4bficlqq7adkchk5tt15l20pag/87876635888.pdfIn PDF document text
- http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/rqv409c9iguvev5ulhc00ome5d/21352481532.pdfIn PDF document text
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fj3tnj61sj93145qcmjdh7rgg7/rapedajigegonamojonijo.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072d7135ed01---30073295007.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-7-14/20210714085202453230.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e67b7d6ebd286867e15d4cf30e537950/56032719417.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/a9glo8hjrc3jiv4jv02da3mic6/magemu.pdfIn PDF document text
- http://terralindahigh1981.com/clients/866868/File/94709321080.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161165d3bc4d70---60333457044.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_off0000c520.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC520	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dd37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD37	10932 bytes
SHA-256: `671e369fbd556e4b886edeb236daf6807e4f8c4e82876acc6a311f8a70f4dcfa`
`font_02_sfnt_off0000f668.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF668	16060 bytes
SHA-256: `750f22f425763c9ae97d7c700c1a7977093aaf2bd4ac774ab3c8935ee5a4c522`

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