PDF malware analysis — malicious · 211c83733c3029f2

MALICIOUS

PDF

79.0 KB Created: 2021-08-07 09:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23

MD5: 87e3bb87b146c9d4677349624bdaa83c SHA-1: b66c80cdada806cdc484c97d2afcf2a04e4db489 SHA-256: 211c83733c3029f21da56ac93b7345f2dae9e719039be8afbb740930eed61ce9

154 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 0.7801

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 https://ketchas.ru/uplcv?utm_term=letras+abecedario+con+dibujos+para+imprimir PDF link annotation
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d56509e5c9d---63440523094.pdfIn PDF document text
- http://urotunisia.com/uploads/FCK_files/file/84172543782.pdfIn PDF document text
- http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/54995146499.pdfIn PDF document text
- http://ducnhua.com/upload/files/18211448196.pdfIn PDF document text
- https://atraba-holding.com/userfiles/file/79393973471.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b0e0ac51---48626794415.pdfIn PDF document text
- https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5b8bb899---bosawogakuxak.pdfIn PDF document text
- http://amexeuro.com/an3_Uploads/file/64166451890.pdfIn PDF document text
- https://mudraconsultancy.com/uploads/files/mosejutidetatuperalelan.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/96239899210.pdfIn PDF document text
- https://tidaksusah.com/contents//files/41928261996.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda4a1eaac---duxamixon.pdfIn PDF document text
- https://dm288.rs/slicice/file/zisekezuxinedobokofaxiw.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b928fcab0d6---51893757980.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccdf141d25---tifobakidevi.pdfIn PDF document text
- https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/57adde8fa7939b1adbd6132d38776833/48560438760.pdfIn PDF document text
- https://alternativecarrepair.com/userfiles/file/wimoleduvirowabubazabo.pdfIn PDF document text
- http://ed-web.cz/userfilesfile/jewegavem.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd0d86b706---ruxot.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ig5n4bi83l0b41vamg307krcd4/zajusasig.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39ea1f2e7---88365322318.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a0eff186f61ae7a8e4fe51a8a6938692/rorarowexiv.pdfIn PDF document text
- http://birons.net/wp-content/plugins/super-forms/uploads/php/files/27651a8bd2b9a65e4279826f5291c8db/47753442274.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rjv9vi0fclqpimtthgeljg5og2/gebokasomazajirobe.pdfIn 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_off0000f911.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF911	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011122.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11122	16520 bytes
SHA-256: `17dab69886bbd3ec2a6b7f0b1d65c3601f0d4afd9e3fe3dca6a26fc3206f9cfe`
`font_02_sfnt_off000127a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127A6	10956 bytes
SHA-256: `d1010f8a780e55ebe691e222d2f5adf69cb9a5a919d2ce213f4a7fdc99a6aed4`

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