PDF malware analysis — malicious · 6ae548a6ac53019e

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 06:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: c5caa4e62053b164222fc3a117cbd39f SHA-1: ce19e8485f021608e31807dba8897cd777227a18 SHA-256: 6ae548a6ac53019ead38b4d4c6e07ab493b8a4ba6e73424b4814bc0794263af6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs strongly suggest it's used in a phishing campaign or to distribute further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=tuberculosis+intestinal+fisiopatologia+pdf PDF link annotation
- https://coopinproject.eu/ckfinder/userfiles/files/46522482047.pdfIn PDF document text
- https://paron-rebondir.com/uploads/files/rafivugamedanin.pdfIn PDF document text
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hsti728nfu8cb5jai8g8nribh7/nijajuvigigopetimivozum.pdfIn PDF document text
- http://dgjst.com/upfile/file/wutuvifosatapafomadasosa.pdfIn PDF document text
- http://ajivikafinance.com/userfiles/file/95150493376.pdfIn PDF document text
- http://szentdorottyapatika.hu/files/gokulasofilagojawabetoguf.pdfIn PDF document text
- https://go2germany.ru/files/file/xarafigipirix.pdfIn PDF document text
- http://eska-lift.ru/userfiles/file/21573017265.pdfIn PDF document text
- http://qhzs88.com/admin/fckeditor_upfiles/file/2021070322302480554.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbaa458a4d44af8c3399e55425b12abc/6742471831.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd6116121---vuwogimopoti.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5f0ef853---rirulegokuparoriki.pdfIn PDF document text
- http://machinegroup.ru/img/outer/files/wijosafazexemixolovasor.pdfIn PDF document text
- https://umutisi.com/umut/upload/files/tebukibegitan.pdfIn PDF document text
- https://netiko.ge/img/Data/file/51233638117.pdfIn PDF document text
- https://lapiadinafelice.it/file/pufipovonudo.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec3772550---sevuv.pdfIn PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/t65714mb76jspf6a5p8bkedch4/waduxikojono.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdb5fc1b9e---dukaro.pdfIn PDF document text
- http://toyotaquangninh.org/data/dulieu/files/3425945257.pdfIn PDF document text
- https://hotelmitrutarija.com/uploaded/files/laradilapojaxi.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74b405322---logagaxulisam.pdfIn PDF document text
- https://anfauglir.com/images/file/jixaboliro.pdfIn PDF document text
- https://melz-feu.ru/upload/7954746406.pdfIn PDF document text
- https://kisikana.hr/userfiles/file/tefomebonugeme.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_off0000ba24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA24	10996 bytes
SHA-256: `42cb512904960e842987312708ebd89301fc446ca2869322f77cc58c4af804ec`
`font_01_sfnt_off0000d364.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD364	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eb76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB76	15524 bytes
SHA-256: `a6e7a0cd910a2b7ff0da3781b673dfdb671afadb89790c37f4b1b6e630fe9eb2`

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