PDF malware analysis — malicious · a8c0572ecb6bde53

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 12:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: db16f466420a132fe209dccb17f54aa9 SHA-1: 2e3561e3782fb43a7876b90bbcab5f85d643cca8 SHA-256: a8c0572ecb6bde53aab38bfd55be75607ca30df4fd6e30e1e93140542c62ca62

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many of which point to compromised websites or disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates malicious intent. While no scripts were extracted, the nature of the embedded links and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=vpn+joystick+pokemon+go PDF link annotation
- https://seo-methodes.com/userfiles/file/liwexenib.pdfIn PDF document text
- https://redac.ch/upload/xomaretasebazajugugu.pdfIn PDF document text
- https://dentalrud.com/userfiles/file/10869623643.pdfIn PDF document text
- http://ty-universe.com/image/files/20210926_093439.pdfIn PDF document text
- http://vividconcept.in/userfiles/file/jurixudimo.pdfIn PDF document text
- http://westhygiene.hu/editor_up/vawurajomekeboduvo.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d06873254ccb89768aced982f7048909/kuted.pdfIn PDF document text
- http://hoanggiaphatstone.com/upload/files/zejora.pdfIn PDF document text
- https://autopsrus.com/ckfinder/userfiles/files/69428720830.pdfIn PDF document text
- http://rooptex.com/uploads/kigozolesepize.pdfIn PDF document text
- http://partnerplus30.ru/images/fornews/files/33607525701.pdfIn PDF document text
- http://artecgroupservices.com/imagenes/file/difirixatunugusifezulobe.pdfIn PDF document text
- http://tongchangkj.com/uploadfile/file///2021091808000971.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/dfd182544613dcaaf78a3b56841cf093/kulawuk.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141e122cb6d3---lasonolosilunawesalaje.pdfIn PDF document text
- https://greengenome.in/admin/userfiles/file/kujuveviporu.pdfIn PDF document text
- https://endobible.com/userfiles/file/ponosil.pdfIn PDF document text
- http://expresskaliski.info/file/jorakis.pdfIn PDF document text
- http://pro-group.ru/userfiles/file/25446705037.pdfIn PDF document text
- https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/77c6976df3a4b1dffa4bff60aca85d08/31920124660.pdfIn PDF document text
- http://chothuexeninhbinh.net/data/dulieu/files/82332561464.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_off0000aab7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAAB7	15088 bytes
SHA-256: `2ee7619622a1c1f7516af8d570b34c4b742486768a0942938cf1ccdbc45e289c`
`font_01_sfnt_off0000d123.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD123	10716 bytes
SHA-256: `91b255ec0f825b91418fbd34c71a572b81fe6f6d31806a5746d06a502ccb2afd`
`font_02_sfnt_off0000e9cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9CF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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