PDF malware analysis — malicious · e214518e6cab1c19

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 13:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: 3908b53ea8db52afb88139377a394c2a SHA-1: acc5806439d675ce8ef610602f8e2978917efe83 SHA-256: e214518e6cab1c1943047b54538055701c43eeacda9da1f0ddbfe00292149f7f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely for SEO manipulation or to distribute further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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://happypalettebnb.com/CKEdit/upload/files/86400048111.pdf In PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec2071578---kumip.pdfIn PDF document text
- https://bearings.vn/images/ckeditor/files/1323368473.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18141a6abb---sidadefuzavom.pdfIn PDF document text
- http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160894d4c0832b---13621579164.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d603813c---mivapezemasip.pdfIn PDF document text
- https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1f5e0658e38f02eb67832e407873a67f/bifevepaxitapikekij.pdfIn PDF document text
- http://infinivideo.hu/sites/infinivideo/files/borajef.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/uhm9me915cc4fhtpt49pchi5uj/31680472792.pdfIn PDF document text
- http://phaptangpgvn.net/app/webroot/upload/files/35608579296.pdfIn PDF document text
- https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5ddeea826cfe136e739abbab9bf8f852/27243128904.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d61e39e5f---85011755362.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f209e06cd0---47106659031.pdfIn PDF document text
- https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e0725de2ac80506d5d5773aa6696d2eb/mazimo.pdfIn PDF document text
- http://alltechsro.cz/files/lonojerumifebizoxed.pdfIn PDF document text
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160723df801f7c---fofekeroponatubewimoxof.pdfIn PDF document text
- http://africanhairbraidingsalon.com/userfiles/file/pizaremarezuzoluketupuveg.pdfIn PDF document text
- http://qhzs88.com/admin/fckeditor_upfiles/file/2021071304503980554.pdfIn PDF document text
- http://gemwishrs.com/ckfinder/stones/files/nazizaxisobifoxodibirava.pdfIn PDF document text
- http://sanxuatbanthinghiem.org/app/webroot/uploads/files/wekob.pdfIn PDF document text
- https://amatnieks.lv/pictures/image/6710499086.pdfIn PDF document text
- https://coevent.ru/upload/files/55311938376.pdfIn PDF document text
- https://anukulagrotech.com/ci/userfiles/files/dokejawadovizakerosujoxoz.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/rp0pcjl2rtd828h7vjcmg9otrf/desavunivadukixala.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6e8664f44---41750354911.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/97c4bf0a594cec581a6ba9798e09857d/31324465317.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=western+aphasia+battery+test+pdfPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In 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_off0000b9c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9C7	10676 bytes
SHA-256: `687e636c49f97e8c4ff7904dcd15fe840d2c660c6fd91297f7bb73661e85403a`
`font_01_sfnt_off0000d1f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1F9	14884 bytes
SHA-256: `ee4e7fb294572c70b5b2269d21199255245713b421729e0eda121e25d4790e01`
`font_02_sfnt_off0000f736.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF736	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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