PDF malware analysis — malicious · 01c67a3ab0385543

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 19:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: b019e0d612a5f9fc191185bf1a1641ef SHA-1: 3e93efc594378634bbc1f05366b3a5ae9904a737 SHA-256: 01c67a3ab03855434deca078905b4126b1a2eb68426e96a7dba0e5ef8e404c57

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of a PDF_RANDOM_URL_LINK heuristic and the ML_NYX_PDF_MALICIOUS flag strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection point towards a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://allytemp.ru/uplcv?utm_term=tyson+fury+fight+free+online+stream PDF link annotation
- http://cerritos.songhakbbq.com/uploads/files/lareparinefusapobodidup.pdfIn PDF document text
- http://lor-rostov.su/userfiles/files/31749701230.pdfIn PDF document text
- http://sosonomo.com/ckfinder/userfiles/files/36536359789.pdfIn PDF document text
- http://alacartedesign.de/userfiles/file/woxeliv.pdfIn PDF document text
- https://vas-vill.hu/userfiles/file/19966700885.pdfIn PDF document text
- https://groupburuemas1.com/contents/files/41476838663.pdfIn PDF document text
- https://girl0229960192.com/upload/users/files/15497432867.pdfIn PDF document text
- http://perchegouet.com/ckfinder/userfiles/files/8917135370.pdfIn PDF document text
- http://aviafond.ru/userfiles/file/velepujonalodegekepexenek.pdfIn PDF document text
- http://auxerretv.com/content/public/file/vatozumoreko.pdfIn PDF document text
- https://techielingo.com/fck_uploads/files/59133851422.pdfIn PDF document text
- http://studioagm.it/userfiles/files/mubewefaxijabawapapakax.pdfIn PDF document text
- http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1356716580.pdfIn PDF document text
- http://orthodoxnews.us/file/nolalimazuxopo.pdfIn PDF document text
- http://cocoon-source-harmonie.fr/public/file/7813824903.pdfIn PDF document text
- http://multiflex.ru/userfiles/file/81732725156.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140154957ce9---11153372659.pdfIn PDF document text
- http://kompletucetnictvi.cz/files/file/78508177411.pdfIn PDF document text
- http://mitsubishilongbien.vn/images/ckeditor/files/zedowovinokuz.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132229fb67e5---xozet.pdfIn PDF document text
- http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/18333045485.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe90a1ef6---80061863520.pdfIn PDF document text
- http://mirutte.com/newsfiles/files/25463998437.pdfIn PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161326e3c254bb---20607699033.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_off0000e0ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0EA	10840 bytes
SHA-256: `bb2dc26a9856f7abeddea042b1b680e16a4c61812111445e7e4de0d76a428207`
`font_01_sfnt_off0000f9c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9C7	18912 bytes
SHA-256: `77c0117d4a274d082708ddc2de721db2b7d503ebc6fe5caeb9b96b630ad4fe05`
`font_02_sfnt_off00012b3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B3E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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