PDF malware analysis — malicious · b187207afd48bb4a

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 11:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02

MD5: 872b151ac89bedb3da5cbb0fcb3c82b7 SHA-1: a0b9456c00672120a0ece54389590d277eebaa5b SHA-256: b187207afd48bb4a75864798f26dcd08138dabd1e68e6339e4941bf2917b03c2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.8988

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 http://askort.pl/Upload/file/jasivusati.pdf In PDF document text
- http://ancient-theater.gr/media/file/28095736261.pdfIn PDF document text
- http://innotack.com/userfiles/files/nilekug.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adac329ca05---88817581885.pdfIn PDF document text
- http://dalnoboy.org/data/filestorage/upload/files/gakudapereju.pdfIn PDF document text
- https://cityface.cz/res/file/nujuvowijog.pdfIn PDF document text
- http://3e-recycling.ru/app/webroot/filesfiles/manoxiz.pdfIn PDF document text
- http://falegnameriacastiglione.it/userfiles/files/morodawapuliwibawixa.pdfIn PDF document text
- https://alarrabnews.com/images/content/content/file/48202599125.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a733b465b12---42465192191.pdfIn PDF document text
- http://bunny888.com/ckfinder/userfiles/files/xuxasunedirepas.pdfIn PDF document text
- http://toyotarent.kr/FileData/ckfinder/files/20210806_8631655FCD3DF478.pdfIn PDF document text
- http://sro52.ru/uploads/files/76262615294.pdfIn PDF document text
- http://dianacb.cz/userfiles/file/85864953778.pdfIn PDF document text
- http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608057e346f12---tofejolikiwotugomo.pdfIn PDF document text
- http://cuatro-pr.org/sites/default/files/file/37511913900.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c022906c1b---85211055937.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b248e382f---63777638773.pdfIn PDF document text
- https://consurs.ro/ckfinder/userfiles/files/bopiweb.pdfIn PDF document text
- http://extrastyle.ee/ckfinder/userfiles/files/poluvesut.pdfIn PDF document text
- https://preciseenergygroup.com/media/655960988.pdfIn PDF document text
- http://bertoniamministrazione.it/bertoni/public/file/boxipujonisowojep.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t7546jki7pbs81hpr69k70dm04/jagamofanopu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=advanced+care+oncology+and+hematology+west+orangePDF link annotation
- 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_off0000b8b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8B4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d0c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0C6	17132 bytes
SHA-256: `3932f1134dda6cd13798fe213890515becffc8b0e209b5a95450073d3b6bef25`
`font_02_sfnt_off0000fb61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB61	10972 bytes
SHA-256: `3936fcd43bae873f7599c1251d5fc424de9a8df49f4f642ea2c19cee315dfad7`

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