PDF malware analysis — malicious · 8441d14922465fb6

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 07:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 1d740e6f46f14af77f3908203708fe97 SHA-1: 095ff640003085a3f293e6f4bab3e593155adf65 SHA-256: 8441d14922465fb66b2390792fef9ffa5b3712f5a6d0676eac859e0fc194be6f

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document's structure and the nature of the linked URLs suggest it is designed to lure users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.6559

Heuristics 5

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
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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/96qkvimir55mmqgtogmelfo3up/ditazokadavonavesumam.pdf In PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3e06a1f9---feraxevedijoxabenikis.pdfIn PDF document text
- http://sattamatkapatti.com/userfiles/file/sikevuwedadej.pdfIn PDF document text
- http://afghansolar.com/userfiles/file/39055231707.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/73632130707d99ba1462d55f0db31a4f/surisuteronavosavina.pdfIn PDF document text
- http://sporteambiente.it/ckfinder/userfiles/files/bujijotupijunes.pdfIn PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/d3o2l0r676qur81mo5tvr9lpp5/robelogakunakevideded.pdfIn PDF document text
- https://malayalamfoundation.org/admin/my_files/file/23703485045.pdfIn PDF document text
- http://studiolegalezullo.eu/userfiles/files/baxegasu.pdfIn PDF document text
- http://soundspace.eu/Upload/file/81235563261.pdfIn PDF document text
- http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437dc5c141---bazukimugumibodop.pdfIn PDF document text
- https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/7d9cd31db6a8ad99b3468e1abe7c457e/56798398272.pdfIn PDF document text
- https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/lepilegigufadirojosezupuz.pdfIn PDF document text
- https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f4d5157aa70d45a3a49485fa855568d4/75606732364.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cd83d1448d0---54213197899.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90d807c76---nofofoxipinopewu.pdfIn PDF document text
- http://e-kva.ru/admin/ckfinder/userfiles/files/80355066588.pdfIn PDF document text
- http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/jajowinijubinuponabaga.pdfIn PDF document text
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/146576e47knmclqc139n6ai72l/84922751999.pdfIn PDF document text
- http://gintaras.cz/userfiles/file/vetadugabe.pdfIn PDF document text
- https://www.leasing.net.in/ckfinder/userfiles/files/93799488536.pdfIn PDF document text
- http://myucmas.com/userfiles/file/nuludopedudi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pdf+file+writer+in+javaPDF 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_off0000d785.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD785	10340 bytes
SHA-256: `cbff14ee03b660bb7557b55a6da2c38e8eaa5a7ec2b0f7143fb9ec30fe59b216`
`font_01_sfnt_off0000eef5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEF5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010707.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10707	16944 bytes
SHA-256: `13c0d90b87787ff20e04ab0ba674b9d3578ec5dd01172d7e5fcf7e99f93a8140`

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