PDF malware analysis — malicious · c161423e5cdabdbe

MALICIOUS

PDF

76.2 KB Created: 2021-06-05 16:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02

MD5: 0e7251add0bf523d423f479665982af6 SHA-1: a6241e93a22ed6a55060d91f60bbad7685263fa4 SHA-256: c161423e5cdabdbed649eedcada10a4267c0f969bb077a686bbeac95f3307e58

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a lure related to 'Qualities of a good teacher essay in hindi' to entice users to click on the embedded malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://irlanc.ru/uplcv?utm_term=qualities+of+a+good+teacher+essay+in+hindi PDF link annotation
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/23fce8f5e9ce3a25df04595b06643700/deraxezaliliditebirive.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e060756c47---71027935260.pdfIn PDF document text
- http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/turefaxu.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/82712890987.pdfIn PDF document text
- https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/86470c516cf15d65418f1376e3a66576/pojigigadowoxudef.pdfIn PDF document text
- https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/v0sf0ki180dpust5en5d6pds8l/28643773136.pdfIn PDF document text
- http://azizolace.cz/images/file/kodexinamex.pdfIn PDF document text
- https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1d246d3f3c6f1dfb56bda7ae13bdc525/94815709167.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09b79ff9e---43785225167.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073474c212d4---76517278567.pdfIn PDF document text
- https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0b09b5c97b1ff822dd24a8ace3ffe9ae/kilaliw.pdfIn PDF document text
- https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/dcklud3mdc8l428e0usq4goa1o/14433787717.pdfIn PDF document text
- http://dfh-consulting.com/userfiles/file/20698167858.pdfIn PDF document text
- http://allasclub.com/campannas/file/24318635864.pdfIn PDF document text
- http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/p5dg0pc8inqjii975n4bs8e443/modoge.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2674e3757---31768843036.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://scripts.sil.org/OFLIn 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_off0000e575.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE575	5328 bytes
SHA-256: `a94ade37f537776cf0c39fdd8b83255deb36b78dc7d49bcdd7252187ee6d1bb5`
`font_01_sfnt_off0000f790.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF790	10692 bytes
SHA-256: `fb56c31e4278ada97e602c7263814566f8fd073036de48250a952fb8b503792d`
`font_02_sfnt_off00011c2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C2A	16240 bytes
SHA-256: `4009372b163b3f445d3f1f71485fdc914f33364c79904b121c1603929874874a`

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