PDF malware analysis — malicious · 546ee401f1c1f44b

MALICIOUS

PDF

76.2 KB Created: 2021-08-29 20:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 93c9872e717495f47128479b36efca6b SHA-1: 6bad78fad0fef2a9317509b1f92ff303bbd550b1 SHA-256: 546ee401f1c1f44b5f5c2dcdca7daf76bf455c6fb6fcc580bf3413a95bfdf628

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content. The presence of numerous URLs on disposable hosting and the use of UTM parameters indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.8018

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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e44786684f3---34363264712.pdf In PDF document text
- http://all-pass.com/folder/editor/file/66185477490.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0fa0edfe5---vokuzipog.pdfIn PDF document text
- http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/87166267721.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be1eb61d6de---wufivigi.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869da6d103e---fidesuxositibanut.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a756eb04493---5067492862.pdfIn PDF document text
- http://tsradviseurs.nl/mailing/images/photo/file/41677080770.pdfIn PDF document text
- http://www.hon-ro.hu/userfiles/files/77797616720.pdfIn PDF document text
- http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/zabifidivezasizijekarax.pdfIn PDF document text
- http://landpas.pl/upload/file/wasojideb.pdfIn PDF document text
- http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e54132bdb---44387945823.pdfIn PDF document text
- https://siangyun.com/upfiles/editor/files/19073623587.pdfIn PDF document text
- http://oresteruggiero.com/userfiles/files/10565256897.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7e799cca15c7c753a1813e1bef98e499/80532803404.pdfIn PDF document text
- http://proxima-design.cz/files/file/fozegi.pdfIn PDF document text
- https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/27697334479.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1c0b156af0932319b1046f684ac268d6/bididawudatizerok.pdfIn PDF document text
- https://pima-alarms.rs/slicice/file/65215181462.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/6658438451.pdfIn PDF document text
- http://studioarchperissinotto.eu/userfiles/files/2320118652.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=corporate+governance+exam+questions+and+answersPDF 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_off0000ce96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE96	17324 bytes
SHA-256: `30d1df56bf23ef6bc6f94a466547d2913c74761f25ebe006f436d6ffa05d442e`
`font_01_sfnt_off0000fb7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB7E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011395.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11395	11340 bytes
SHA-256: `51e84c86aa269c647a8ee6cb3b69a0a4db29c80492027facbe03de1f3d0bad78`

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