PDF malware analysis — malicious · 1d73921515b94961

MALICIOUS

PDF

84.1 KB Created: 2021-08-30 06:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4e6f6b341f7361f42acc227e020c4296 SHA-1: 00fa3e80a286e4d2103ae5121e58bd31b05afa34 SHA-256: 1d73921515b94961564fd433aa2a0bdddc3bb7e23e31f0ab68e31bd5ae1323bc

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 contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://allytemp.ru/uplcv?utm_term=spanish+orals+questions+and+answers+cxc PDF link annotation
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f95ba9e4cf071279579595620a92a5a1/97036008852.pdfIn PDF document text
- https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0be2a4aa3b7fb1905fcf968985f960b3/kolozowib.pdfIn PDF document text
- http://cudicio.it/images/file/benugonozotik.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d03b8889---88057874151.pdfIn PDF document text
- http://biotop-zamosc.pl/userfiles/file/842706063.pdfIn PDF document text
- http://abwingscolley.com/uploads/files/kuruxe.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7cae1490656ffd2c7a08380cee6c372e/jijolofazoxepagaf.pdfIn PDF document text
- http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/205671630.pdfIn PDF document text
- https://brawlcall.com/ckfinder/userfiles/files/jadifikebigepuvaseluw.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6d29cf305b147e3b15f8557d99ce4f99/gesobimavovakarib.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e3586b719---zojenimu.pdfIn PDF document text
- https://cambodiaangkorhomestay.com/userfiles/file/6173168917.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g1iuormgu5rb6gj3p627bev9al/bapovugig.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088dcf3a33b9---zivunezunokitakevabitifop.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/20c20aab40118db36f72bfc9efaaf781/6210872835.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0d00c7e8---5628920647.pdfIn PDF document text
- http://sitoad.com/bbqjoekey/files/202107222312343240.pdfIn PDF document text
- http://vendsol.com/userfiles/file/88959226052.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f7cad92bc---71916293135.pdfIn PDF document text
- http://dichvugiayphep.biz/upload/ck/files/92707169691.pdfIn PDF document text
- http://oreade-breche.fr/userfiles/file/bogexokezuxoxixevewaf.pdfIn PDF document text
- http://findmecakes.com/userfiles/files/1391797255.pdfIn PDF document text
- http://thevisionkharj.com/userfiles/files/redotuzopukinan.pdfIn PDF document text
- http://guides2alpes.fr/uploads/file/lezologiwaponiz.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609413e2be159---42199650740.pdfIn PDF document text
- http://cerrutistudio.eu/userfiles/files/mavuvogijebeduvu.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_off0000ddc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDC4	11120 bytes
SHA-256: `51e9a9b953b6362b38f373af3cbb8ca0d9db5852674affc7daa1caba831915c9`
`font_01_sfnt_off0000f784.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF784	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010f96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F96	18972 bytes
SHA-256: `91231e555718f79fc3c74d457137ebe5ac6c0efd1f7370f221c1db58d2bdc3f1`

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