PDF malware analysis — malicious · 13a7a7d50ac6efcd

MALICIOUS

PDF

66.8 KB Created: 2021-09-05 13:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 66d76c39f797afa54e3c8ea3c33bcfe6 SHA-1: f8bb33c0b98aec33bd03490fcdeacc1742bc31d7 SHA-256: 13a7a7d50ac6efcd956be555589abe756cb767012f731255b10ade8dce4dc851

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the malicious intent of directing users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.5231

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://laborke.ru/uplcv?utm_term=resume+cours+atomistique+pdf PDF link annotation
- http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/48407184878.pdfIn PDF document text
- https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/0e2cdfa9f01fd3dcc2bb21338d49fb33/96492160281.pdfIn PDF document text
- http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d61af496559---midijofeboxubilabuso.pdfIn PDF document text
- https://isosklo.cz./uploads/8314425591.pdfIn PDF document text
- http://loveperfectionschool.com/upload/file/28047784482.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160af2c412e2e5---72969157781.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caf91e7ecbd---lagofe.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236347726f2---wowivizit.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99424cb87459fc9bd2cec7eeebbd1330/konugij.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b7e2f1ed---kuvulaluxu.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ba9e0d5a3---datuvowidarufaputavulupom.pdfIn PDF document text
- http://dailygameresult.com/editor/UserFiles2/files/samoxawedosa.pdfIn PDF document text
- https://unosms.us/userfiles/file/46913430496.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43c883f83b---vefiwexulopupexidutulax.pdfIn PDF document text
- http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f262363e0a6---86266499863.pdfIn PDF document text
- http://aostavet.it/userfiles/files/ronagikunizulisurova.pdfIn PDF document text
- https://kindeeyudee.com/ck_files/files/7848815096.pdfIn PDF document text
- http://seychelles-resort.com/images/blog/file/18031493036.pdfIn PDF document text
- http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///panorixizenamobetupesur.pdfIn PDF document text
- https://tailormade-sales-marketing.com/userfiles/file/12933630523.pdfIn PDF document text
- http://bonsite.nl/phpcmsys/file/17617160127.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0c98da92---88012834207.pdfIn PDF document text
- https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/093c9d7bbe269c3ad9ba7db25a72e338/pimuvewerusa.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_off0000d153.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD153	10920 bytes
SHA-256: `1085466cdef0ed3353dd21b9548393f7229287743ee4f980c5de054268353765`
`font_01_sfnt_off0000ea73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA73	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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