PDF malware analysis — malicious · 3e6f94281cc61078

MALICIOUS

PDF

76.8 KB Created: 2021-10-01 16:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 34cfb633a19d38b52c176a4997fd4f75 SHA-1: 36cd3908a0f08aca1ce2464f5b2af7e91efe246f SHA-256: 3e6f94281cc61078a5396f362df43900a55b08ec44fe2b8fc1d559eb5cb4a2d7

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to obscure the final malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 http://feynburg-uhren.de/uploads/90762446950.pdf In PDF document text
- https://caror.hu/ckfinder/userfiles/files/zelapapolugojotixudamizet.pdfIn PDF document text
- https://prospr.fr/ckfinder/userfiles/files/bepaguxidiwelosevaz.pdfIn PDF document text
- http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613524832332f---52430092644.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/79fc4369a09c38540c16302b54cefccd/moligigadozodadakiro.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16155eb1940f65---kafuxejebekiset.pdfIn PDF document text
- http://ondamarinarest.com/upload/files/kekokavoworozevopavi.pdfIn PDF document text
- https://www.lsv-wittlage.de/ckfinder/userfiles/files/20741896462.pdfIn PDF document text
- http://www.startservis.sk/novy/ckfinder/userfiles/files/96198611588.pdfIn PDF document text
- http://studiomedicoveterinariobellucci.eu/userfiles/files/9417471092.pdfIn PDF document text
- https://aventuraholidays.elladatravel.ro/mm/file/65782995753.pdfIn PDF document text
- http://vipnjl.com/userfiles/files/58415771847.pdfIn PDF document text
- http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ku0l434gp5m1br7au8h8o8526b/nifejoxulotetelobok.pdfIn PDF document text
- http://bnblspecialities.com/userfiles/files/57473103256.pdfIn PDF document text
- http://michael-dhom.com/webseiten/file/93559407126.pdfIn PDF document text
- http://sobinco.cz/ckfinder/userfiles/files/31608003027.pdfIn PDF document text
- http://www.sunriseacademy.in/ckfinder/userfiles/files/71100603141.pdfIn PDF document text
- http://daegyung.kr/userfiles/file/20210909010636.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614447d46bde6---91926302566.pdfIn PDF document text
- https://campermagazine.tv/public/file/jolabizababilopu.pdfIn PDF document text
- http://nbnjl.com/userfiles/files/59058228302.pdfIn PDF document text
- http://dsacare.com/admin/uploads/file/6287103644.pdfIn PDF document text
- http://cck-brno.cz/ckfinder/userfiles/files/8895537765.pdfIn PDF document text
- http://wxbeimei.cn/upload/ckimg/files/202109260453408152.pdfIn PDF document text
- http://ylpcl.com/ckfinder/userfiles/files/gonaxamilujevoduso.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=apk+file+manager+windowsPDF 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_off0000c1cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1CF	10904 bytes
SHA-256: `822246833bc3dca9d7ef6db279bf43144b03232e0318f77c57a2896dc9c43fb8`
`font_01_sfnt_off0000dad9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAD9	19416 bytes
SHA-256: `1f718837f488c8b203cee39a183aae5dcde71011cd57e9a626fe146c0627ae31`
`font_02_sfnt_off00010d6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D6D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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