PDF malware analysis — malicious · a9482d00542647d3

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 14:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: f6a5299446373b4db6b0cff17b6ee22f SHA-1: acc17147e093b695c06d3d0fec6ee56dd9f1fc21 SHA-256: a9482d00542647d34cc2947fa51482993997d163a28b9a1dba0c44d7537baf4b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://groupunsur3.com/contents//files/79371228125.pdf In PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3c809edba3f6ecfea5abb6cfd94aac92/roxekatopisupexazoj.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a8d2d66f---87224251050.pdfIn PDF document text
- http://luatsutiengtrung.com/app/webroot/uploads/files/56272570874.pdfIn PDF document text
- https://securitydm.rs/slicice/file/vobagapalixuwo.pdfIn PDF document text
- http://abwva.com/uploads/files/gefetapase.pdfIn PDF document text
- https://hamasataccessories.com/userfiles/files/88029073403.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e3af73848ca515f3315f0a7d207f6f85/dexejorikuludipeboded.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16128574838515---55732600537.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n68gpl0tlbb65hmnnh6k5f61fv/jusafosogobowukumanasuw.pdfIn PDF document text
- http://fishtech.org/uploads/userfiles/file/file/38980388184.pdfIn PDF document text
- https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/1942fbe470956f66f018d295245f92d6/34466017028.pdfIn PDF document text
- https://wfca-czech.cz/temp/userfiles/files/24454673990.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7885cd2c75739afb3dd96fcbee57a50c/goseloperofasewar.pdfIn PDF document text
- http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9edbb2d1b---vaduj.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdcc24b03f---kupevunijuzo.pdfIn PDF document text
- http://zakuskymoser.cz/www/ckfinder/userfiles/files/80987241820.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286ecee257---84620268861.pdfIn PDF document text
- http://yorktownhs1987.com/clients/57482/File/36232851267.pdfIn PDF document text
- http://vce34.ru/attachments/file/83863656016.pdfIn PDF document text
- http://udokutscher.de/gfx/userfiles/files/zikumofefumisividexagi.pdfIn PDF document text
- http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/83obsf6h63gf86hngngtsf3sqr/80366319411.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1cc50de1607beba9facc76ba490db961/45396159797.pdfIn PDF document text
- https://facades-et-traditions.com/actualites/file/wetamegewile.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d660f78c435---15766127833.pdfIn PDF document text
- http://becskeicsodajo.hu/admin/fck_upload/file/10320032249.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lectins+to+avoid+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_off0000c6da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6DA	10488 bytes
SHA-256: `c6e119235538c86726dfed419ae984a051b1cbb87afeb0b8a9839472e8caf015`
`font_01_sfnt_off0000dedd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEDD	16776 bytes
SHA-256: `bd56eb5c4454bdb0f5decf34670f28a3c1a105c04fd1a87a65f157d53cbe4e98`
`font_02_sfnt_off00010a09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A09	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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