PDF malware analysis — malicious · 4b7a5ac5f8cd110f

MALICIOUS

PDF

80.7 KB Created: 2021-08-14 10:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f43cbfde97df8f7bb70ba31040e4d685 SHA-1: 9502af3bfe4e7e5a923efdbbcf6b4bd1d963ff32 SHA-256: 4b7a5ac5f8cd110f9bf09e0227a4fffefd7204899961c7119e145b7dc08740fa

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress upload directories or other disposable hosting. The primary purpose appears to be directing users to external sites, which is a common tactic for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the main indicators of compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

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 https://wastran.ru/uplcv?utm_term=ver+peliculas+online+gratis+en+espa%C3%B1ol+latino+completas+sin+descargar+estrenos PDF link annotation
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073db5fc4f3f---21258733950.pdfIn PDF document text
- http://papinchess.ru/userfiles/file/2995147417.pdfIn PDF document text
- http://marcelponjee.nl/ponjeefiles/file/23125575318.pdfIn PDF document text
- https://shidoremicrosys.com/media/76030405330.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/26aae67f1f34705f6c565b64f9bf6bf1/33252568671.pdfIn PDF document text
- http://alibabashipping.com/userfiles/file/texagowuduvado.pdfIn PDF document text
- https://alamansyria.com/userfiles/file/10108257050.pdfIn PDF document text
- https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/149adc0383c524ae309e57ccdd69fd54/93485147559.pdfIn PDF document text
- http://ipmarketing.net/userfiles/file/felapiwigedas.pdfIn PDF document text
- https://zoomkish.com/basefile/zoomkishcom/files/59063451877.pdfIn PDF document text
- https://terminal.hr/userfiles/file/67964122895.pdfIn PDF document text
- https://bestcoloringpages.com/userfiles/file/81906549825.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160740db5c5bd4---39657809741.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/265716533f92778243b47c05a316cb2a/zivejowovinawimiramaroje.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vir9ko6q3ki2c489gthq10lbr7/tavoxelomorerix.pdfIn PDF document text
- https://preprodpcb.com/userfiles/files/32117063150.pdfIn PDF document text
- http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/wafosiximeranawulejuvoj.pdfIn PDF document text
- https://pypconsultores.mx/userfiles/file/3592080791.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gjphc54ld44v18d02r0f7bcp1m/42934660458.pdfIn PDF document text
- http://golden-candies.ru/webroot/files/files/vasog.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160944e97129b2---29135632607.pdfIn PDF document text
- https://gbagencement.fr/uploads/file/nufisajetobafemituzutax.pdfIn PDF document text
- http://lezeckastenakosice.sk/upload/files/40235085959.pdfIn PDF document text
- https://marblobaths.com/app/webroot/img/files/zelajuribitewajanawub.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607efcffe8c90---vedipulurikapupuj.pdfIn PDF document text
- http://home-delighted.com/user_img/files/60596536098.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c5aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5AA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ddc1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDC1	11132 bytes
SHA-256: `179ba4e98a268d0c0715347182b54714e30cf2a5e7f5b1407d2687a51e81112d`
`font_02_sfnt_off0000f73c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF73C	3508 bytes
SHA-256: `a3bf0b16ca74dd3a1a8c385e7fa721831ed91eb778e7f98a1241eb5c45ebe8ec`
`font_03_sfnt_off0001050b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1050B	16932 bytes
SHA-256: `fbe91984ed33a3a6a259ae7e9a186e78d238fdd9e2f79852566f05b2f3833ddc`

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