PDF malware analysis — malicious · 4506b323514b4e13

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 22:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 302a925a805b3be5921e6ab720a7b7a8 SHA-1: 8915b24ac4534931cb505486e71cb2dfa8261216 SHA-256: 4506b323514b4e13cd1395e4c8075472ddfc973a5cd658a2e8bacb01ebd3116a

164 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. The file contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable domains, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of multiple external URIs and link farm heuristics reinforces the attack pattern of luring users through deceptive links.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 7

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
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://medvor.ru/uplcv?utm_term=iphone+texts+not+delivered+to+android PDF link annotation
- http://ministerium.pt/files/67493334091.pdfIn PDF document text
- http://hnc2.com/userfiles/file/lemojabepipawazap.pdfIn PDF document text
- http://kkagro.com/media/images/upload/file/9417058321.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/6d3b3hn6tt8hseeipvmpforang/81291872303.pdfIn PDF document text
- http://abwcrainhwy.com/uploads/files/45075201595.pdfIn PDF document text
- https://airxps.com/userfiles/files/75857872052.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1n55r2rqbc7rhnfqospn6r3ih1/xadarosovirifutovulira.pdfIn PDF document text
- http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/bamazanusukavo.pdfIn PDF document text
- https://dom4m.de/userfiles/files/depavajuvevenanoxomuv.pdfIn PDF document text
- https://laurallo.com/ckfinder/userfiles/files/29411946977.pdfIn PDF document text
- http://hijoin.hu/editor_up/zomarawigedemiwi.pdfIn PDF document text
- https://gmnavarra.es/ckeditor/files/salixowis.pdfIn PDF document text
- http://turskazka.ru/ckfinder/userfiles/files/dajer.pdfIn PDF document text
- http://tofuyatogo.com/uploads/files/4683737483.pdfIn PDF document text
- http://gediklimakinahidrolik.com/resimler/files/26770261279.pdfIn PDF document text
- https://webshopplus.nl/app/webroot/files/userfiles/files/21997595560.pdfIn PDF document text
- http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/soxeligejadasapow.pdfIn PDF document text
- http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/6372446834.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62458c992---xotigudumamelazedaj.pdfIn PDF document text
- https://teater77.nl/userfiles/file/fokabupegaxuwapajegukeni.pdfIn PDF document text
- https://office-agglo-larochelle.fr/userfiles/file/10600434343.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2bd6cc354---davok.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141835717225---xofabuxekibuguzaruvig.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_off0000e9da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9DA	18108 bytes
SHA-256: `05ab50fac69af0640e70829e6b19ca519b5032355faf8db06b7b71fdb37ff007`
`font_01_sfnt_off00011921.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11921	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013138.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13138	10608 bytes
SHA-256: `4f43f752c1d3a532f6871a484a019a0947383dc1372ee778b0f0e938bb626e37`

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