PDF malware analysis — malicious · c2fd560904d9d91d

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 23:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: d4b6a286d2e931f7c593f0453885eac5 SHA-1: 88cb51ad4fa33c57c525af83d98d9f9ca695ce4f SHA-256: c2fd560904d9d91d0918660e2a03659096c67d97fe0465d53123a3ca10d9de4d

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads or exploiting vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.8945

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://chugguwang.com/files/fckeditor/file/63472380029.pdf In PDF document text
- http://www.haztartasigepszakuzlet.hu/pics/file/20134757454.pdfIn PDF document text
- http://jumpstart.mobi/userfiles/file/79360745807.pdfIn PDF document text
- http://antwerp-reefer-tournament.be/argt/files/ponojorakeb.pdfIn PDF document text
- https://sealskinz.ru/files/file/jufolomej.pdfIn PDF document text
- https://concertwristband.com/resimler/files/27243854870.pdfIn PDF document text
- http://massarentearchitettura.com/userfiles/files/32123816385.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb615e332---genuz.pdfIn PDF document text
- http://quimis.net/js/ckfinder/userfiles/files/zexoxemadasawuwejomabu.pdfIn PDF document text
- http://american-security-inc.com/assets/ckfinder/userfiles/files/nosedufodipuzikajo.pdfIn PDF document text
- http://abwingsva.com/uploads/files/jejudetibafot.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16145e5f2ceb26---luzaj.pdfIn PDF document text
- https://bacninhonline.com/webroot/img/files/gewesutikazuladodeb.pdfIn PDF document text
- http://teewer.mn/ckfinder/userfiles/files/12668562336.pdfIn PDF document text
- http://colegiosantarosa.com/uploads/imagem/file/mazipoparan.pdfIn PDF document text
- http://cec-intl.ru/app/webroot/files/file/30498026450.pdfIn PDF document text
- https://aronabritcan.com/userfiles/file/kiguxubifebesuzorenewivop.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ddf5efc610a27bfeadce84a75adb2aac/bakajipetufeso.pdfIn PDF document text
- https://escolaalfa.com/userfiles/file/ruvewowep.pdfIn PDF document text
- http://ncteonline.com/userfiles/file/sikasokerolajuzu.pdfIn PDF document text
- http://cameralehiep.com/hinhanh_fckeditor/file/bedemuzuboxaxixozotokemez.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443de1c1a5c---tinalunekazedalogififeg.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pc+suite+samsung+galaxy+j5PDF 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_off0000e16c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE16C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f97e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF97E	17696 bytes
SHA-256: `7550c1632dc1253ef4f1924ac08d4c36b3ebfb3a1e53067a7f94a4663a315bce`
`font_02_sfnt_off00012785.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12785	10936 bytes
SHA-256: `411afd25c9255daeaec351a787c38a891aa25ba14e07bf699b6226d7395e4154`

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