PDF malware analysis — malicious · e5928610846e1a3b

MALICIOUS

PDF

101.8 KB Created: 2021-06-30 22:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 43f6f16693566b46357bc87922a6b204 SHA-1: 893c98ed24dc554463a05d36b1ce3d4b1b3fab3f SHA-256: e5928610846e1a3b106672797a452fd67baa06d77b669c0bcd6aea382f700109

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress sites. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate it's designed to host a link farm on disposable hosting. While no scripts were extracted, the presence of these links suggests an attempt to redirect users to malicious content, likely for downloading further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9711

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://coretry.ru/uplcv?utm_term=pdf+editor+professional+free+download PDF link annotation
- https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a407e068137d33ec744452f4ea624df4/62356544577.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb73ce60bb---mobimepuxiwemoto.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffaf276461---pefivokajeloxipukarirugi.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9b50699fedd548b852c4b3523aaa8c86/8024688585.pdfIn PDF document text
- https://amitadevnani.com/userfiles/file/wotapowuxijeg.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efdf4969f0---53729255820.pdfIn PDF document text
- http://amon-syotengai.com/userfiles/file/nusodalawabolozot.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee3fbe1c8---pofibi.pdfIn PDF document text
- http://teplolux72.ru/upload/file/45348853673.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vmesn9qouse1o5gf08pebj8jt5/66731651935.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60fcf7e7e3---gugul.pdfIn PDF document text
- http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jlkqond2at8iu5uoea1nl6vrr8/viposadi.pdfIn PDF document text
- https://sambelteri.com/contents//files/kinuk.pdfIn PDF document text
- http://romengo.com/ckfinder/userfiles/files/41956974397.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/19c0d05947e50930dea48ed3ef9ed9a4/85231066221.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae08c7e7000---55087356613.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e443a6fb---24064693247.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609bffc3e196a---vokaka.pdfIn PDF document text
- https://bawaniint.com/ckfinder/userfiles/files/5282905146.pdfIn PDF document text
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d94598204---sepururutepumaz.pdfIn PDF document text
- http://am-assets.com/aom/magnolia/userfiles/file/21413473416.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/birizipegosinone.pdfIn PDF document text
- https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a53ccb321084cba3af18a8611936b306/wizumilijiw.pdfIn PDF document text
- http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/u27j770th6egdsm6mmquj93ho1/84169387908.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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f74d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF74D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010f5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F5F	30032 bytes
SHA-256: `f9683c359b2ad5df701cd7b472f114e17e1db3b4ee483165c218eb772c8fee80`
`font_02_sfnt_off00014ab2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14AB2	3224 bytes
SHA-256: `ca4d72eb1d57bd0492afafd86e3bc3bdf205b069ba45c6d7d4633b42817a6486`
`font_03_sfnt_off00015776.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15776	16488 bytes
SHA-256: `c26743b87dfacdf0858f4b0a7ceb4ab939aa0c8d2a68f1ccae901a3bec0cb177`
`font_04_sfnt_off00016e85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16E85	10580 bytes
SHA-256: `1a9404426d5e01e59f45e69a9c9748e886aedee1b13946c154f31d74ac8c7297`

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