PDF malware analysis — malicious · 6bbacd56967ecc3c

MALICIOUS

PDF

83.2 KB Created: 2021-08-25 12:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 9281a28e195e26964116c22338babb02 SHA-1: 1c71ef8866972ec7230ac98a8623b96591ed8b26 SHA-256: 6bbacd56967ecc3c6bf9fb17575c062f07e449729f184d3cb3f0bee53f9b175d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with a spearphishing attachment used to deliver a secondary payload or phish credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://chochosanencino.com/uploads/files/71745623784.pdf In PDF document text
- http://a-aqua.fr/ressource/site-image/files/lutujefoganirizejunazaf.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1bh3ej5e5dnd56bmk9ol0dogul/12615395933.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/b4615scph5qe32sbc0f057pd4j/28938632284.pdfIn PDF document text
- http://visit-pune.com/userfiles/file/naviluligawufikaxurekixaj.pdfIn PDF document text
- http://rafaelokazakov.com/file/jorunetorebisoso.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3egiif2qrvfiq9djf1v4ikk6ea/43800855259.pdfIn PDF document text
- https://songhongresort.com/img/files/71231195086.pdfIn PDF document text
- https://www.winsum.frl/ckfinder/userfiles/files/33947556229.pdfIn PDF document text
- http://expresskaliski.info/file/nirisibade.pdfIn PDF document text
- http://animationcoach.com/userfiles/file/92218458757.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e39bddb2---favajukalilimipidefa.pdfIn PDF document text
- http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokutujorarowem.pdfIn PDF document text
- https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/8768251490.pdfIn PDF document text
- https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c6d241f0f10cb16cbee54e2fa9d00d46/sifamasegamulovupu.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e15b1a24850---giros.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e24fae10693e3398c4d6310507426425/nezufiwutixevobejo.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722ba1b2d07---58104413945.pdfIn PDF document text
- https://boumqueur-edition.com/upload/fckeditor/file/25816910881.pdfIn PDF document text
- http://benthanhsgfarm.net/images/uploads/files/9091960941.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9aa9f485ed67829e8f087495ba82f7fd/999092673.pdfIn PDF document text
- https://veterinarycarefoundation.org/userfiles/file/88253472825.pdfIn PDF document text
- http://uticachemical.com/files/upload/files/81549444727.pdfIn PDF document text
- http://soflacops.com/clients/83266/File/mavatasugivi.pdfIn PDF document text
- https://skvacations.com/userfiles/file/javaxuvom.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/87caaadca1ebf58550ef47e73b86e83e/lelobik.pdfIn PDF document text
- http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/saliwekeboxinizo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=different+kind+of+cuts+in+cookingPDF 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_off0000e270.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE270	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fa82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA82	16148 bytes
SHA-256: `14d787901ef0a86df956ea1db28e31fa7c5de5e1bf9f373bf831f92f00b40c27`
`font_02_sfnt_off0001241e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1241E	10636 bytes
SHA-256: `376c7442d53e0c112e02ea3f57784ab585eac7fbe2987ebbacf6f2bc1c8e51d4`

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