PDF malware analysis — malicious · 15eb35ed8ef44599

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 09:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 031750414057aa092b4a07d31ee7c5f2 SHA-1: 0ca9a8bfa5cc6f5447c07944a66c5a5b1b1949b3 SHA-256: 15eb35ed8ef445997ae6a5d00d66557bd85631ff374caf4852d3b5a4308302a5

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. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure strongly indicate it's intended to redirect users to external malicious content, likely as part of a spearphishing attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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 https://wastran.ru/uplcv?utm_term=are+u+afraid+of+the+dark+book+pdf PDF link annotation
- https://mmgrowersg.com/ckfinder/userfiles/files/1356332448.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e483d31983bb33db64b7812d6aff0d01/pinomigufogaza.pdfIn PDF document text
- http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9cafbf622---vuvimezazemufovoz.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d32190964d---2903489888.pdfIn PDF document text
- http://degrossier.nl/uploads/file/77837994175.pdfIn PDF document text
- http://minhanh.com/files/gikigutoj.pdfIn PDF document text
- https://rajatotogroup4.com/contents//files/mavov.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dadab7a119f---fimususabuwobi.pdfIn PDF document text
- https://sanagustin.cl/files/gikagizadanomeruf.pdfIn PDF document text
- https://www.marjojaspers.nl/ckfinder/userfiles/files/78159765919.pdfIn PDF document text
- https://dimensioninteractive.com/WYSIWYGImage/file/bapobezadezubi.pdfIn PDF document text
- http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/gebagavazonokomap.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e096beb3d688d914d0d57f68674c7a19/46981744325.pdfIn PDF document text
- http://www.hmh.sk/files/articles/file/39469622873.pdfIn PDF document text
- https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/98199092755.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/380bebe01658837a27354361bbbbb788/53828203714.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5aca4e2ad0789adc20386570e97ac8ce/25475489300.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ab6d3f6ab0f3779f87e6362cc2f3414e/fasaxuxigikiruwapasijo.pdfIn PDF document text
- http://anhuizpyy.com/upload_fck/file/2021-5-9/20210509060325460430.pdfIn PDF document text
- https://kindeeyudee.com/ck_files/files/33061970811.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086209630ba8---rawarozuwininagerukiro.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072d51843547---44936898132.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecdc03d711---degedadonalavo.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88b651c1f---48685340290.pdfIn PDF document text
- http://www.humillacionyestrella.org/ckfinder/userfiles/files/49835459469.pdfIn PDF document text
- https://marathonlaval.com/userfiles/files/19245316186.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2139098d5---13477942522.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_off0000de73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE73	17728 bytes
SHA-256: `f73aaa1821eb8b7bb0364bfa84ba854caf40e401be39903ba5da3b0174a80ed6`
`font_01_sfnt_off00010ca8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CA8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000124bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124BF	10592 bytes
SHA-256: `31a38891c9a340fec86d7151736503397fded3f9d914763ac86b4f25c34190a3`

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