PDF malware analysis — malicious · fad135a26c814618

MALICIOUS

PDF

79.5 KB Created: 2021-08-17 22:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 40884a10c5a371257a4bd9d15982738a SHA-1: 4cb0646a19555e5fdabe62b28c5f1a9ba8eaeac7 SHA-256: fad135a26c8146182c49fad07d7c6e37a6e313eda63f891285e60411a427b0ed

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm, directing users to multiple URLs hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware delivery. The presence of numerous links on potentially disposable hosting further supports a malicious campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.6426

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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
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://www.de.ruben.pl/ckfinder/userfiles/files/25685973040.pdf In PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0744a60ed9adf6f66adf5ad71fd58293/nevezerejen.pdfIn PDF document text
- http://kirakuramenandsushi.com/uploads/files/lixasizedopidusesonun.pdfIn PDF document text
- https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/m0basdktlkmor2ib9mf0n3lc64/faxezupe.pdfIn PDF document text
- https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/emsfgaq83shoidlucja1rfa8nr/tokikerur.pdfIn PDF document text
- https://kraftyz.in/ckfinder/userfiles/files/wegalukosapule.pdfIn PDF document text
- http://whatdwellswithin.com/file/23254479772.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ba429860---jefopuxabimilowitowasasu.pdfIn PDF document text
- http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e6cf71e05081761611c8e085438c1e42/37612182462.pdfIn PDF document text
- http://luxcottage.ru/stroykamen/userfiles/file/sosawezatuwe.pdfIn PDF document text
- http://telegid.tv/userfiles/files/ziwegobivuxas.pdfIn PDF document text
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/b0lbnstscgk0pememvq58p0kf7/56636830431.pdfIn PDF document text
- https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe89ec183---46229598272.pdfIn PDF document text
- https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6d76b095d7a60148b5caafcb5acbc340/83486587752.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/dc65eb178591e24fd84836943a0f63bd/12119583342.pdfIn PDF document text
- http://huiking.cn/uploads/file/130451474651.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac726b074a0---vipapupemulurij.pdfIn PDF document text
- http://xn--b1adcbbai1bezln.xn--p1ai/content/File/77315572222.pdfIn PDF document text
- https://yellowstonewildlife.com/dotedija.pdfIn PDF document text
- http://daiichilogistics.com/uploads/news_file/99014384296.pdfIn PDF document text
- https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94548560e---93448530811.pdfIn PDF document text
- http://scbczy.cn/up_files/file/20210604_202843.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/985f5d88d2d028224341450e1646444b/64413463123.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+the+different+types+of+computer+cablesPDF link annotation
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf257811647---fonidogemize.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ec1c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC1C	11232 bytes
SHA-256: `a737851bc425d425b8947c6706d93e888473528fa632719b533446a68995606d`
`font_01_sfnt_off00010606.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10606	16896 bytes
SHA-256: `51b9b5bd4cfd577c366fb02abbe28b8fb7718e0f89ed2d1b842e3b6eec1b51c4`

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