PDF malware analysis — malicious · 87be12733e96c616

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 20:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 79fadb4d9a69e7788ad30c9fe3617a1f SHA-1: 1bea88969583fd6aac4c964e7299ccde1be7be1c SHA-256: 87be12733e96c616efc25d22fe01d6bb9b3d1f65331f6074edac0d970dda1652

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are consistent with a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.7613

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://cructi.ru/uplcv?utm_term=free+psn+redeem+code PDF link annotation
- https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/jaxoviza.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333365aa490---13350563617.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c35622b1b---zodenakoruzusizenawad.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/164fb46996497ef312e0eaa19cec4799/femavegudosidagi.pdfIn PDF document text
- http://hillsdalehorseboarding.com/ckfinder/userfiles/files/68830424017.pdfIn PDF document text
- http://an-ocn.ru/ckfinder/userfiles/files/deledekolorad.pdfIn PDF document text
- http://irk-yoga.ru/upload/files/xowisasekesem.pdfIn PDF document text
- http://alfonsoguiggiarchitetto.it/userfiles/files/gireso.pdfIn PDF document text
- http://vibrator4you.cz/UserFiles/File/15105774334.pdfIn PDF document text
- http://lagunaapartman.hu/images/user/file/69745273102.pdfIn PDF document text
- https://presentkompaniet.com/img/content/file/mawewud.pdfIn PDF document text
- http://climacom.eu/userfiles/files/suvizexowavemewipuf.pdfIn PDF document text
- http://ddservice-bmw.pl/userfiles/file/topazevegazofobutubuli.pdfIn PDF document text
- https://makanbanyak.net/contents/files/23562377381.pdfIn PDF document text
- https://middletonchambers.com/ckfinder/userfiles/files/topofi.pdfIn PDF document text
- http://tanphatinst.com/vietkiendo/upload/file/fepezekus.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/93443115582.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7397ba74c8775f17bf4a0536d9fc2ad9/9155594898.pdfIn PDF document text
- http://sjar-tech.com/uploadfile/file///2021092303472236.pdfIn PDF document text
- http://agapetown.net/ckfinder/userfiles/files/17050292128.pdfIn PDF document text
- https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/254c1e575032ec326b9c4e66c2c61725/romuxugejubosuwinizipidad.pdfIn PDF document text
- https://laplacedesstores.com/upload/file/36298058094.pdfIn 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_off0000bf60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF60	19128 bytes
SHA-256: `02c5d4ab50fdc3f464987777dc53fe8e6c4435a156df2e874d51cad2748577a4`
`font_01_sfnt_off0000eff2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFF2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010809.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10809	10256 bytes
SHA-256: `2f5cce6fb1f4657b70618ad1eb2c54facc3cc8a8f8411d6b5d99e855d626b36f`

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