PDF malware analysis — malicious · ac0f7cd551152546

MALICIOUS

PDF

72.2 KB Created: 2021-10-02 20:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 287ea76f10421e118c8b9c3c60c2c938 SHA-1: 286874cd5abe297d9332172078bc9b45b6a8f92e SHA-256: ac0f7cd5511525468f5ba99bc4501c2816cdc5c255a4e3b758e279ffd2383238

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.5466

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://nomylo.ru/uplcv?utm_term=what+is+secondary+double+glazing PDF link annotation
- http://mixline.ru/img/lib/file/65038071414.pdfIn PDF document text
- https://stop-remont.ru/ckfinder/userfiles/files/sumonafunagodepigijusep.pdfIn PDF document text
- http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/wazibirugijivoz.pdfIn PDF document text
- https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b96f71df40f29f673fb06f78234723c3/suwexeludodezow.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/04502090967b8d2cb170feba990562b1/vavilitetozep.pdfIn PDF document text
- http://gabortech.com/admin/file/mufobuboduk.pdfIn PDF document text
- http://nato-denkmal.de/uploads/file/23258185092.pdfIn PDF document text
- http://violetstudio.in/userfiles/file/5255732420.pdfIn PDF document text
- http://verynailscm.com/user_img/file/87786529157.pdfIn PDF document text
- http://comlark.ru/userfiles/files/55632013430.pdfIn PDF document text
- https://lifesmart.ro/ckfinder/userfiles/files/48912189142.pdfIn PDF document text
- http://ride-on-earth.com/images/blog/file/marudolugome.pdfIn PDF document text
- http://bukvoznaika.ru/ckfinder/userfiles/files/49797356766.pdfIn PDF document text
- http://okna-kurska.ru/page_edit/_samples/userfiles/files/60454522336.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134c31142af1---11245842256.pdfIn PDF document text
- http://krzeptowski.pl/file/94111793464.pdfIn PDF document text
- https://sportuna.be/ckfinder/userfiles/files/tugeporetagapopifaxu.pdfIn PDF document text
- http://barsugo.com/ckfinder/userfiles/files/rafabejuzudujupamewoleja.pdfIn PDF document text
- http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/28810618027.pdfIn PDF document text
- https://fainitelecommunication.com/public/editorfiles/file/63014476960.pdfIn PDF document text
- https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1b41372412659e355b44bf1493389634/14574384574.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ea1eea521---duzolakolepotiboluguka.pdfIn PDF document text
- http://www.romanschatztruhe.de/img/files/toweramemi.pdfIn PDF document text
- https://tpk-m.ru/files/file/telubikimotobiwokumepomu.pdfIn PDF document text
- http://gintaras.cz/userfiles/file/310279023.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_off0000b454.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB454	11056 bytes
SHA-256: `af1f9bb4d20da7b886fe6684a5d82bbc8aaf5e65117880b55ef9ce65043146e6`
`font_01_sfnt_off0000cddd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDDD	17724 bytes
SHA-256: `55a183fdbbebbe8865f092441629d74e0afc2cd7d40c1b71c8809bb7784c59ba`
`font_02_sfnt_off0000e89c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE89C	16076 bytes
SHA-256: `edd152700b9b265bb9e54f52a7dc801aaf81f0b40a10c16c69907bfb04f48466`

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