PDF malware analysis — malicious · eb90d78f32f38187

MALICIOUS

PDF

79.0 KB Created: 2021-09-15 13:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 24eb66244c331f4d54fe450c01d26550 SHA-1: b3431f340709bffc6aa4416d4c5b39599b0240c5 SHA-256: eb90d78f32f3818726b63b61a0339fe77ff3a39f686ee03d2536804a13b450fa

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to websites hosted on compromised Content Management System (CMS) upload storage, indicating a potential phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were extracted, the structure suggests it's designed to lure users into clicking malicious links.

Machine Learning

Nyx PDF Classifier suspicious score 0.3396

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.
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://bigcool.net/webroot/img/files/16988729747.pdf In PDF document text
- https://www.tocbirsen.org.tr/ckfinder/userfiles/files/30299597767.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4443d5cae141eafbf95817017436efac/gotidamedobojosozakixet.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/970b02aca4f0c0417a1f28581b202062/sosewawazisovemofulusotas.pdfIn PDF document text
- https://zohopinler.com/calisma2/files/uploads/gumivoba.pdfIn PDF document text
- http://ccsl.asia/files/xeruxewufixorabix.pdfIn PDF document text
- http://globomax.eu/userfiles/file/gigifapeguveneruzaf.pdfIn PDF document text
- http://mytrangroup.com/uploads/userfiles/file/jufesibimesalifus.pdfIn PDF document text
- http://yao-cheng.com/uploadfiles/20210831233823.pdfIn PDF document text
- http://familie-schiecke.de/images/file/65647936553.pdfIn PDF document text
- http://satthachkhe.vn/image/file/xufadigapakulojenegitet.pdfIn PDF document text
- https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/kewakejalewera.pdfIn PDF document text
- https://datenglagi.com/contents/files/divapudusakopo.pdfIn PDF document text
- http://www.herbertvanderbrugghen.nl/draft/66033185080.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d97655f759393178cdc3e3813579c12b/67945126213.pdfIn PDF document text
- http://naturallabs.de/userfiles/file/36419055314.pdfIn PDF document text
- https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/o6461f08tg14bml09nkep1fpe3/28267636820.pdfIn PDF document text
- http://dermatologomiguelgallego.com/miguel/fck/file/kolefirisenisafa.pdfIn PDF document text
- http://funagamex.vn/PhuongNamGroup/userfiles/files/ruzepegovovugi.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31cd0e336---sovojomuriweze.pdfIn PDF document text
- http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46902722194.pdfIn PDF document text
- https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/5048750151.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+find+wifi+ssid+in+androidPDF 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_off0000deed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEED	17744 bytes
SHA-256: `eff3b16ab04541fd03ce80329079d521c559d7ba82b476e3ae049d9af08b988a`
`font_01_sfnt_off00010d54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D54	10244 bytes
SHA-256: `55e8227007c33214caa6dc05ab8d6536e7187b3f9460229010eefea86ac6e004`
`font_02_sfnt_off00012478.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12478	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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