PDF malware analysis — malicious · bce27673d8edd13f

MALICIOUS

PDF

83.4 KB Created: 2021-08-05 20:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: 81bac214097c6913eb99fb3390afbad2 SHA-1: ad9c92222b6865f0af53b7d8064f362d0d470b3e SHA-256: bce27673d8edd13f7cc4fcd5e917b2f92c36223cf745c5e00fefbf2957d4d4be

132 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external URIs. Several heuristics indicate that the PDF acts as a link farm, with some links pointing to compromised WordPress upload storage and disposable hosting. ClamAV also detected this file as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute malware or conduct phishing attacks.

Machine Learning

Nyx PDF Classifier clean score 0.1993

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
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://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wopoleva.pdf In PDF document text
- https://euroroma-bg.org/files/file/99927308407.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107234f6f61f---82305945182.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/efca0a2cdf195a181002814e8d54c735/bebazidakela.pdfIn PDF document text
- http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/4151821585.pdfIn PDF document text
- http://td-mg.ru/uploads/files/juzev.pdfIn PDF document text
- https://debcopharma.com/userfiles/file/gizufinonin.pdfIn PDF document text
- http://kleiberit.ru/files/file/2713440104.pdfIn PDF document text
- http://matsusushionline.com/uploads/files/45047437845.pdfIn PDF document text
- https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/47eb90008678af16f127d5e62fde1bc3/xemubonukewawisisepugex.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607915d8980c0---60724599800.pdfIn PDF document text
- http://asztalosweb.hu/userfiles/file/wonekaraviwutofegapavifi.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/93902eec8f56ccc82883a94e6fe7fbed/turexaperiparigodefapat.pdfIn PDF document text
- https://mmszke.hu/files/file/dudawodegu.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e104371915b---nopojo.pdfIn PDF document text
- https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/49c08718f16cc8dc663e01ec347649dc/jinibudinuzavum.pdfIn PDF document text
- https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/79553558302.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ab5183a76---dusukigagisadiguwosanojox.pdfIn PDF document text
- http://brandiassociati.it/userfiles/file/31494347491.pdfIn PDF document text
- https://baxsporthorses.nl/userfiles/file/21548736856.pdfIn PDF document text
- https://dintek.eu/uploads/file/96170112351.pdfIn PDF document text
- http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105030206428714.pdfIn PDF document text
- http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609904b3c2686---mibanabufilomagawelok.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9f664734ae2eaf2228d498e11aad631e/maxotokuxopisuj.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0da30628b---27408362545.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=marriage+biodata+format+for+girl+pdfPDF link annotation
- 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_off0000eba7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBA7	16740 bytes
SHA-256: `2d25a5c859d9b908a349147d26acc49a63f9be79ee1ada36299ee4a566cd1bd0`
`font_01_sfnt_off0001174a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1174A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012f61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F61	10704 bytes
SHA-256: `4b229ef18f339bb548f318d84090586e90fe6e33be03e3235c70edad7f0f5224`

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