PDF malware analysis — malicious · 3f94eac44301a39a

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 04:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 91e202d3a5a2867b4c82f46fe524d540 SHA-1: 89cbb91626d0fe95d2b9eb0750f64b1ba3c3fff7 SHA-256: 3f94eac44301a39ab5e571240fd1545c27e2bccaa80e602f1cb2b036765a45de

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

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 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://fzsvybbs.at/userfiles/file/fijezadinikojinovumapemi.pdf In PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc19d34cec---nazamuguka.pdfIn PDF document text
- https://www.profiemg.cz/upload/ck/files/9882157575.pdfIn PDF document text
- http://terredellamagnagrecia.com/userfiles/files/rosokukekelimigilopu.pdfIn PDF document text
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d365020b6db9f44fe1dfc6f92f287d7d/5790949044.pdfIn PDF document text
- http://jedzenie365.pl/ckfinder/userfiles/files/58900214840.pdfIn PDF document text
- http://urgentcarepb.net/userfiles/file/worizuxafokiriloxumud.pdfIn PDF document text
- https://healthmatters.me/userfiles/file/xusofutopumarasurakofajek.pdfIn PDF document text
- http://manilag.com/FileData/ckfinder/files/20210909_0083EB3519561234.pdfIn PDF document text
- http://shepardinteriordesign.com/rw/upload/file/tepixifefanomemenulager.pdfIn PDF document text
- http://89928386.com/uploads/files/202109251413266804.pdfIn PDF document text
- http://www.farmaciavictoriayjmleon.com/userfiles/files/widobuj.pdfIn PDF document text
- http://badischer-kunstverein.de/ckfinder/userfiles/files/newajiposelesetenesupiwif.pdfIn PDF document text
- http://quangcongluc.com/upload/files/7041775362.pdfIn PDF document text
- http://horizonpestservices.com/userfile/basadolokumuwumesade.pdfIn PDF document text
- https://livstyle.ro/home/livstyle/public_html/uploads/files/zurulibowanoraxasi.pdfIn PDF document text
- https://principesgs.com/userfiles/file/vugoponadisoruzofa.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147776392460---36054770608.pdfIn PDF document text
- https://hophamthaibinh.com/upload/files/fivididuxiwonunezapan.pdfIn PDF document text
- http://3234.us/data/attachment/file/xejifiduredufirujobib.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bcb18a81be986cc6d001a0414fca2eeb/73465883515.pdfIn PDF document text
- https://groupunsur2.com/contents/files/6025257979.pdfIn PDF document text
- https://stotex.rs/files/runedapimib.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8703d2981977c908e1321132edab55c7/misajopezuvumito.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=totally+accurate+battle+simulator+download+apkPDF 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_off0000b1bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1BD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c9cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9CF	15024 bytes
SHA-256: `a56bb1d525a60703e11710bb0b06fa8c454a5f27d02a5fa79173311f86c0be1b`
`font_02_sfnt_off0000efd8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFD8	11168 bytes
SHA-256: `e91d82cb443e5371570f20bcb8aa30a5ee762621ddaa506d51712a7265453214`

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