PDF malware analysis — malicious · a3a272c0743cbdf5

MALICIOUS

PDF

121.4 KB Created: 2021-09-05 16:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 5e91b8da198f77876ce174ac22ce60fe SHA-1: 0894e3b666654a3b5e12709be49cceb01ce5cfe4 SHA-256: a3a272c0743cbdf5b4c1341bdd97917e24b0f9040f2efe7757af18907fc1b813

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farms on potentially disposable hosting supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f079aa08---fumatig.pdf In PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c46a3db5db0---nivaxabuzetulabe.pdfIn PDF document text
- https://tonitomov.com/picture/file/8453808009.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dc80f869abbb54bf6300bd2a0446ee20/94053386621.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a487b13d2---filawikenabu.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/2818740109.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3201801877ff21d927ee212fa04729ed/jakupoloditivekenuzos.pdfIn PDF document text
- http://sanmorales.es/userfiles/files/zenapotipolapo.pdfIn PDF document text
- https://auto-rujo.com/images-editor/file/telovi.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2vtcgqhnltp95mahk9uqbsdrd0/bigofanazowukerulete.pdfIn PDF document text
- http://ruresept.ru/files/file/dopemuguvoda.pdfIn PDF document text
- http://caryhigh1987.com/clients/41333/File/41973097356.pdfIn PDF document text
- http://dalaichau.com/files/17073186528.pdfIn PDF document text
- http://color-gateway.com/userfiles/file/44310206021.pdfIn PDF document text
- http://inncredel.com/uploads/4066328764.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c6270938---ridoni.pdfIn PDF document text
- https://bengalroys.com/ckfinder/userfiles/files/dawabubitadexut.pdfIn PDF document text
- http://travellightnepal.com/userfiles/file/saduvanofinumawebu.pdfIn PDF document text
- http://walosports.cl/userfiles/file/91715451047.pdfIn PDF document text
- http://vyveva.eu/UserFiles/File/nemaxesaxinojir.pdfIn PDF document text
- http://cokhibaosang.com/media/ftp/file/93710070009.pdfIn PDF document text
- http://kompletucetnictvi.cz/files/file/15938482339.pdfIn PDF document text
- https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/85452004236.pdfIn PDF document text
- http://aimic.com/userfiles/file/50875071392.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=thermodynamics+unit+conversion+table+pdfPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000155fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x155FD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00016e0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16E0E	16384 bytes
SHA-256: `2531f5c20d6291730a440f5e28b67caf9e552cb04e2c1199e828fc559ae10166`
`font_02_sfnt_off0001848f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1848F	11268 bytes
SHA-256: `80c1761a93b0bcda09a2f12640a40d75dfb1a8ee276edc7096b3ce656564fac8`
`font_03_sfnt_off00019ea7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19EA7	21516 bytes
SHA-256: `2e1589c39472458a9a1c7da83c010ddb4ed9310e0c62d0bc39165365650063f0`

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