PDF malware analysis — malicious · a6e05095e8341637

MALICIOUS

PDF

85.9 KB Created: 2021-07-07 22:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 77b3101453296b38686265a498402206 SHA-1: a6f1cb3a2c13023d7ad0ee839faba7f38315900c SHA-256: a6e05095e8341637263b15743a984b59ee572efb13d59966669e5f84d25ff648

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://hainescentreasia.com/images/file/89814543765.pdf In PDF document text
- https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/4db245507e616b334880cea22cacf6f6/10918954063.pdfIn PDF document text
- https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/88b8b944b2e76280def6fbd9d52cfd7d/mubuxukozis.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1069bbb20061cb0c72ec0488af593368/5953808130.pdfIn PDF document text
- https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db178d121c3---nevusib.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8caf78590---xenet.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160840dd346ae3---dulenupunokarixelugo.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071798712918---boxiwix.pdfIn PDF document text
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4adddbfe374a8da33d44195f336a1f3a/latolovolejilisolumaduzo.pdfIn PDF document text
- https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3ahh6imludq7abj0so777461v3/bukupinarovavemesobinitum.pdfIn PDF document text
- https://pharmawell.eu/ckfinder/userfiles/files/sudaralefapoked.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a0ca4131---robowumu.pdfIn PDF document text
- https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/1a65312ff2bf4c8a61d2e6d2af4e911e/5214398472.pdfIn PDF document text
- https://evrenmentese.com/upload/ckfinder/files/pujovupofusubexurix.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/db32e6ae74589ef37840270e9407d13e/30050845726.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a15798194f5---12373808576.pdfIn PDF document text
- https://cambodiadriverservice.com/userfiles/file/dozukofetadavupuxefa.pdfIn PDF document text
- http://gtlmarinefuel.com/userfiles/file/69800588753.pdfIn PDF document text
- http://nw-line.ru/generic/uploaded/lufofogodegevitawisaw.pdfIn PDF document text
- http://ilovegabal.net/fckeditor/_upload/file/fatifilevujenivizetuw.pdfIn PDF document text
- http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d387ebd34---kinefi.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3cb6a72cd---marom.pdfIn PDF document text
- https://saatyapi.com/upload/ckfinder/files/52067375683.pdfIn PDF document text
- http://fouladsazanco.com/Upload/file/29683375381.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+beef+barley+stewPDF link annotation
- http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/98aabb30bf0bde409ee15fa570b67919/20021233904.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_off0000ed17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED17	17128 bytes
SHA-256: `da794ff5307ccbd4cad67ee5b697332e40700aca829613f556d96a4395228a59`
`font_01_sfnt_off000119fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119FC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013213.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13213	10604 bytes
SHA-256: `648e662a7eb890810fdcf8ddd0afe1c19f595d811d12eede4aeb47a8d4d073d3`

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