PDF malware analysis — malicious · 96cd51b16d82ed68

MALICIOUS

PDF

78.1 KB Created: 2021-08-27 18:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 63ecf678e48ca1d00f890d460d4b6fd0 SHA-1: 8deca74c3a7827500140b14c6a967fdd90248274 SHA-256: 96cd51b16d82ed68eaeacdc2722950431db6ba84c79766d6b50e55f499df6893

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm hosted on compromised WordPress sites, likely serving as a lure to phishing or malware distribution pages. No scripts were extracted, but the structure suggests an attempt to redirect users through a series of compromised domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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 https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/effebaf61afe69e1fe87e3532175ed0f/lajovomelekaborijew.pdf In PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1cdced7b---86841903473.pdfIn PDF document text
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e287655fb---xopuvibusuxumebi.pdfIn PDF document text
- http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/toribuv.pdfIn PDF document text
- https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c26a00d9---89233865796.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba633e813---12794027851.pdfIn PDF document text
- https://natatourism.com/userfiles/files/lomozum.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff5a5133f---jaludemazufatel.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7f3bb8a43d05ed92c08baf0b0ba5a3ca/zezojopadulu.pdfIn PDF document text
- http://fatamorgana.fr/uploads/assets/file/rilibekupujekeviniv.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1610ceba492f88---nafiwafinebod.pdfIn PDF document text
- http://wagnerfamilyreunion.com/clients/866685/File/safisu.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612180b438719---nosifubogosugotupirul.pdfIn PDF document text
- http://studiosiciliani.eu/userfiles/files/12252403369.pdfIn PDF document text
- https://toskov-yordanov.com/userfiles/file/57140792618.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079272d23f3a---tobabogugomodugadofoxewol.pdfIn PDF document text
- http://954move.com/clients/4890/File/nitipirebuwoxusopovi.pdfIn PDF document text
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4e3bee2a968d5eb5d378b4c71dea67fc/dadufaruz.pdfIn PDF document text
- http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb3017db2---50058120085.pdfIn PDF document text
- http://ibconsulting.it/userfiles/files/12236669357.pdfIn PDF document text
- https://appvid.eus/userfiles/files/lujebagowone.pdfIn PDF document text
- http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/01iflk7u9gattnnhsfq964f0a4/31564939859.pdfIn PDF document text
- http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/16211613645.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/21c3bc79d501ed8321bd87fa2b889ac5/rurabekoxoli.pdfIn PDF document text
- http://kool-house.com/upload/editor/file/gukopo.pdfIn PDF document text
- https://farmstead.tw/farmstead/upload/files/teveb.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gold+hex+numberPDF 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_off0000cd6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD6A	17800 bytes
SHA-256: `b53a70fff933878463b7becf4646fd199a5fc67f4660548cb602bc1c64f89e36`
`font_01_sfnt_off0000fb65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB65	10376 bytes
SHA-256: `d317f3281383fa216abea71072c19e2cb7b1c0e2eda4b6240728340398e4f7e9`
`font_02_sfnt_off0001129a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1129A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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