PDF malware analysis — malicious · fd88bfcc39c23336

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 00:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 65fe197dc268005fff44a666d8a228da SHA-1: f9254cbddd552e2b420db3cd22107e048e1b8304 SHA-256: fd88bfcc39c233367392d357ee6d9cb6aa4e457c8a033ff6a8772ac8adb0e20c

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=chrome+password+store+location PDF link annotation
- https://endeligmandag.no/e-brev/data/div/pekinizawotixe.pdfIn PDF document text
- http://maketmaster.ru/admin/ckfinder/userfiles/files/37330042420.pdfIn PDF document text
- https://seerupit.dk/assens/file/detabazajovugewenuperusi.pdfIn PDF document text
- http://teakdeck.pl/files/file/fifupudovo.pdfIn PDF document text
- https://stiglic.sk/userfiles/file/melowitokeforinu.pdfIn PDF document text
- http://whitedwarf.ru/public/images/ckfinder/files/geloluju.pdfIn PDF document text
- http://veterky.ru/ckfinder/userfiles/files/wuvivemidupixadimutamud.pdfIn PDF document text
- http://yishiweb.com/upfiles/files/20210925_085401.pdfIn PDF document text
- https://china-glass-mosaic.vegner.com/userfiles/files/20210921_010740.pdfIn PDF document text
- http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/mugibupe.pdfIn PDF document text
- https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/xajutozofaze.pdfIn PDF document text
- https://laps.pl/userfiles/file/97269011185.pdfIn PDF document text
- http://studiomedicoveterinariobellucci.eu/userfiles/files/3771983611.pdfIn PDF document text
- http://happinessgown.com/upload/users/files/14357252776.pdfIn PDF document text
- http://big-blue-bus.com/pics/fotos/1/file/xiligetevikoji.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96d67098d---xavorolojusikariforosaku.pdfIn PDF document text
- http://tdvvietnam.vn/webroot/img/files/18120152048.pdfIn PDF document text
- https://relaxbotanika.cz/ckfinder/userfiles/files/36189371740.pdfIn PDF document text
- http://aumnat2car.com/ckfinder/core/connector/php/upload/files/kajile.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0f3d87c56---38240100501.pdfIn PDF document text
- http://chukguwang.com/files/fckeditor/file/zavadixuxamepumito.pdfIn PDF document text
- http://prompol.com/media/file/zunebipodetepixidi.pdfIn PDF document text
- http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8ea9aaf2e---fodoxu.pdfIn PDF document text
- http://linuxnewyork.com/draft/media/50952823283.pdfIn PDF document text
- http://aurora-c.jp/files/files/gedisas.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_off0000b3d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3D2	10896 bytes
SHA-256: `2629277a8eddd726af73433b13ad22715d36380bd155484a4917f91f1946d3b2`
`font_01_sfnt_off0000ccf0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCF0	15776 bytes
SHA-256: `e47567e1e3dd4e09b46e26229d6960e9ac56eb94de56c01a15d1cf6dc06ccff1`
`font_02_sfnt_off0000f55d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF55D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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