PDF malware analysis — malicious · ae2f7885534193af

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 15:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e1c0c40e82ae8f601eddefda0346aba6 SHA-1: 2c2b4b1b17e04234b082c718209dbd3e11038346 SHA-256: ae2f7885534193af5e1aadb869dacce6f3dc83de475c80f8776231d5e08efca7

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS uploads. The embedded content appears to be malformed or obfuscated, preventing detailed analysis of any scripting or specific payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=extended+essay+guidelines PDF link annotation
- http://gmicropilotes.com/uploads/files/wumujazo.pdfIn PDF document text
- http://asijskepotraviny.cz/files/file/jesuvogezeguxizatitexulep.pdfIn PDF document text
- https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/55ad0b9bfa4ae1a47afa1d06147f5827/pavopeximonipebon.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee18022517---suterugawovut.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/fe55527c9e8749c2d6596c69b33119c6/sufeborurakutareregofepax.pdfIn PDF document text
- http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093db7262ba1---2314427771.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607b37cd84f0b---43551673874.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/597b9a1a35e5a82a0031bffe0046049f/pomanegoveb.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f121b3132d---kosogumafewotonogabebula.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/160c4cd711a5d3168c15423bfe7718f7/42001218576.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6895c5b15---14661723765.pdfIn PDF document text
- https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ro5ee5i95v1807p9g0cs9466r5/79968135015.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b2f1affea7cb3b7f74a2b9d3c7cb9d80/41981856460.pdfIn PDF document text
- https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf149b396c6---defarakukirosazebomakane.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20530d23f6---dajov.pdfIn PDF document text
- https://alajuusa.ee/media/contents/file/86564330513.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a509ab7c2e1---63310562575.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0c6d33640---75243511680.pdfIn PDF document text
- http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861456dd74a---21775162501.pdfIn PDF document text
- https://anfauglir.com/images/file/paloximopimezivogiwefova.pdfIn PDF document text
- http://shinies.ru/img/lib/file/21116818448.pdfIn PDF document text
- https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/otrl90fl470861tpgj48dcekjm/31457950919.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738d88dbf34---80379565425.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc85fe3909---99057265702.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_off0000fa52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011269.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11269	10500 bytes
SHA-256: `44994d836316090676ca97627ef0f64793982a59065a1ef3d1a3fccaa4ffd59f`
`font_02_sfnt_off00012a3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A3D	17280 bytes
SHA-256: `bcf70dadc5a69982e70a2d463ea0fe5932bb760d3527700a80aa23ddfdecc09e`

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