PDF malware analysis — malicious · f4357080927d1462

MALICIOUS

PDF

89.5 KB Created: 2021-09-06 19:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: dd4b215168562c9bf7c24a61170aa85c SHA-1: 1386bc88f8be89838a9707dd9ffb32f0a5c28a18 SHA-256: f4357080927d146227f75a3fc7dc7ff582c21e2607b6f1e0b6c44722600dd780

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript or other PDF-specific exploits to facilitate the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161191435a22e0---zojomopinojov.pdf In PDF document text
- http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3b93ed30fafc8a9e7e3ce7b337ebb82b/23086598052.pdfIn PDF document text
- http://ibshop.gr/uploads/_uploads/files/5498804357.pdfIn PDF document text
- https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e27ca11e32993f7d37604ab3fce6ee85/25304008993.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4a463b1f---tususasuzobazotamutumoxo.pdfIn PDF document text
- http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3c837f096a06b5e25e7071b28b8456e6/7956796950.pdfIn PDF document text
- https://aldurra.ly/images-editeur/img/file/rabiwabunuvewufagixebovar.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ba959988422abe987e29ccfaf94447f5/juvofesulixosisatew.pdfIn PDF document text
- http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc8aaa525b---tajavusowib.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c52fd833d37---jitimaseluvixo.pdfIn PDF document text
- http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/fojoxa.pdfIn PDF document text
- http://goteneplast.se/files/images/file/50163317793.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095f867c926f---tavugimo.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0d93f5cc2f968922f955a97543e6f1ac/69423368892.pdfIn PDF document text
- http://crisismobile.com/ckfinder/userfiles/files/wexedijiz.pdfIn PDF document text
- https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/usa8tocua79m38ijg6gcq0ohp1/4952255525.pdfIn PDF document text
- http://travellightnepal.com/userfiles/file/vibeb.pdfIn PDF document text
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080457ee38c0---45951601585.pdfIn PDF document text
- http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cef87acd0---57281973352.pdfIn PDF document text
- https://cailux.lu/userfiles/files/51184398867.pdfIn PDF document text
- http://atek-ent.com/upload/file/68720798193.pdfIn PDF document text
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/q9l758o8kvrs4hno6h0rsunvgi/38881756506.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160be06dd180d4---nanegezepule.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mushroom+types+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_off0000f5c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5C9	19452 bytes
SHA-256: `4e650be4bed9cb77fcb3dafd5f347858291375b1ea973bc5add5c27b756bad87`
`font_01_sfnt_off00012859.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12859	10564 bytes
SHA-256: `4da8070b97413ace6231a41dec0f203da0b9112cac192f6dbb3d709698ebd560`
`font_02_sfnt_off0001408b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1408B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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