PDF malware analysis — malicious · 8f186f9e6e8cfefa

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 13:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0cdbb356d2e69b1944c7a57b7c4a57c3 SHA-1: 82fbf0a6a934260bdc1152ce2d1975c9c8332c76 SHA-256: 8f186f9e6e8cfefa352a2bd1bfa486f075b053f44e1616f120d7ee837b9ea772

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness. The primary purpose appears to be acting as a link farm to distribute traffic to potentially malicious destinations, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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 http://dreamcatcherltd.com/userfiles/file/wopukovoropejaniko.pdf In PDF document text
- https://wsbtitan.com/images/file/zabuzenaluludokapepiki.pdfIn PDF document text
- https://people11people.com/uploads/File/60028067115.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a2fa4d49---68561678344.pdfIn PDF document text
- https://xn--fct8ml6mwue.tw/uploads/files/zanusejer.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08ad1b8c7d---kefuxaxoguwibesut.pdfIn PDF document text
- https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adeef6fa75---kizotumijam.pdfIn PDF document text
- http://smartcevent.com/clients/871459/File/kiwonemapusejudaxuxi.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842c86451c1---zawoxugukel.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160922f67bd24f---wawopozogenapixog.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/34cc2ebcc2d84cefcd9253ef7024faa0/pibimo.pdfIn PDF document text
- https://greenlakepaint.com/ckfinder/userfiles/files/68514916176.pdfIn PDF document text
- http://vervesimuhub.com/userfiles/file/10172720206.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2669681a---41945130656.pdfIn PDF document text
- https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/kofeximogedenoxa.pdfIn PDF document text
- https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/41f81f76b3d5f0bca71b6008c05cf485/xizil.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319c9bec5ef---90299307405.pdfIn PDF document text
- http://shinex-auto.com/userfiles/file/25765330124.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161060d8423be5---55730513631.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3be5d8710a4ba0e8ae9c14f3e48a78ac/68880227180.pdfIn PDF document text
- http://studioingtassinari.eu/userfiles/files/fidobexidow.pdfIn PDF document text
- http://punaide.com/userfiles/files/bekuxozebakifufu.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9bb8d1e3e---8230326216.pdfIn PDF document text
- http://tetobox-budapest.hu/uploads/files/minode.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9a0288e2---mitabedodekolinitukaxub.pdfIn PDF document text
- https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/2596887450.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d6416a9569b8b50a72652fcd00b1834e/90755813994.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=monarch+butterfly+facts+pdfPDF 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_off0000ecfa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECFA	17852 bytes
SHA-256: `5b090e923c9725468cee7c2ee52bd31e2083e843e7e316b71e945065d501fe5c`
`font_01_sfnt_off00011b43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B43	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001335a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1335A	10972 bytes
SHA-256: `5051214895e15099d19026bc30a8aa0034ad08738bee66a8838a7400a2815c94`

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