PDF malware analysis — malicious · fa4d34789297dae5

MALICIOUS

PDF

68.5 KB Created: 2021-09-02 19:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: db814184c0a55e5840e202515ea249c3 SHA-1: 74d528f24d75d04a52a2ae68be45d0fb5e084374 SHA-256: fa4d34789297dae55fda574c451ee969abcb87125d1f6536f4ad2d087006c311

132 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or credential harvesting.

Machine Learning

Nyx PDF Classifier suspicious score 0.4905

Heuristics 6

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.
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
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://crysiq.ru/uplcv?utm_term=nevera+mabe+230+litros+manual PDF link annotation
- https://groupunsur1.com/contents//files/95830643437.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa156476d17---serujonuj.pdfIn PDF document text
- http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/97845919746.pdfIn PDF document text
- http://liberty67.com/clients/41815/File/zixobawijemaxebosab.pdfIn PDF document text
- http://headrepublic.pl/images/files/30547092323.pdfIn PDF document text
- http://altus.pl/userfiles/file/fesavibana.pdfIn PDF document text
- http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610071fe86839---43409470171.pdfIn PDF document text
- http://stellarp.com/userfiles/files/38440988395.pdfIn PDF document text
- http://dok-vo.ru/userfiles/file/94475071247.pdfIn PDF document text
- https://dimensioninteractive.com/WYSIWYGImage/file/jefuwisigaxanexofetawija.pdfIn PDF document text
- https://ei-hotel.com/free_images/files/3182275707.pdfIn PDF document text
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/90e0cd2d44334ba136186f553b030cde/gubivemevef.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff486f00f0---33920408795.pdfIn PDF document text
- https://ewt.cz/res/file/fepilo.pdfIn PDF document text
- https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d38491b75a5c618f7f29231034267136/vesedebonagepazu.pdfIn PDF document text
- http://harrisonfamilyreunion.org/clients/868801/File/71031677598.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf05144613---91187862103.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160843183baf97---pijozozavadekiwusufanuwi.pdfIn PDF document text
- http://cdmatik.com/uploads/file/31718366133.pdfIn PDF document text
- http://nawaress.com/webroot/js/ckfinder/userfiles/files/64193220571.pdfIn PDF document text
- https://pointvirgule.ca/upload/editor/file/32156442438.pdfIn PDF document text
- http://wsp.pl/userfiles/file/73947002465.pdfIn PDF document text
- http://jingchengs.com/jingchengs/ckfinder/files/20210808135825.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_off0000b7ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7ED	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d004.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD004	10964 bytes
SHA-256: `41d3ed81285a361b13ead9d2c048339f267d2c3052e6480881ecc60544be5508`
`font_02_sfnt_off0000e989.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE989	16916 bytes
SHA-256: `d64bb1b131083d72626c4149d5f8a38d7a46fd764fe270d76558195406962450`

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