PDF malware analysis — malicious · fa6fd98d99d74c2f

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 05:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 2f5b627e5cb6aed8f5197a99c4fff36d SHA-1: 7583fc76f794e07c67e024c957a311c6be1a99af SHA-256: fa6fd98d99d74c2f3c6dc792e4db9d99b2ccddc1a635e66640f441a21d6c3beb

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, pointing to numerous URLs hosted on compromised or disposable domains, likely to obscure the ultimate destination and evade detection. The presence of embedded JavaScript and the redirection to external URLs strongly suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 https://chcial.ru/uplcv?utm_term=how+do+you+clear+memory+on+android PDF link annotation
- https://adtw1.elfjane.com/ckfinder/userfiles/files/momofibup.pdfIn PDF document text
- http://bibliotekaszamocin.pl/img/upload/files/kigajilebotimib.pdfIn PDF document text
- https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/36258640060.pdfIn PDF document text
- http://xn--oy2b19v1mb1yi.com/userfiles/file/26642993011.pdfIn PDF document text
- https://safrano.pl/userfiles/file/54060884810.pdfIn PDF document text
- http://serextion2006.com/js/upload/files/kibufirobopuzazikeresotaz.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161458ab0d4579---33959987189.pdfIn PDF document text
- http://fsf-vastroad.com/userfiles/file/37982541750.pdfIn PDF document text
- http://i-harmonics.com/upload/files/70007878798.pdfIn PDF document text
- https://birsamundapark.in/userfiles/files/75506025572.pdfIn PDF document text
- http://residencecarlofelice.com/userfiles/files/buroneserubapawaj.pdfIn PDF document text
- https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8trjbvdsg2g0dii3a3mg3sr7gj/2593071680.pdfIn PDF document text
- http://rayhovietnam.vn/upload/files/tavizanoni.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/sorizetes.pdfIn PDF document text
- http://acril.ru/ufiles/files/tazekuladusete.pdfIn PDF document text
- http://redigonda.it/userfiles/files/26602606562.pdfIn PDF document text
- https://grdr.org/paidel/ckfinder/userfiles/files/40480791540.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/88df095fa6a0e1e7546852e0142142b7/sonevepinetabilazajenarod.pdfIn PDF document text
- http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/zemurefonipokelewum.pdfIn PDF document text
- https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/34030774519.pdfIn PDF document text
- http://vrajacreation.com/uploaded_files/userfiles/files/38874333178.pdfIn PDF document text
- http://sistersaviopublicschool.com/userfiles/file/gonogavotanelu.pdfIn PDF document text
- https://dadesigning.com/daduserfiles/files/29132956689.pdfIn PDF document text
- https://casasholidays.com/scgtest/team-explore/uploads/files/3190429504.pdfIn PDF document text
- 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_off0000d5e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5E9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE00	10556 bytes
SHA-256: `32870129e8e4c1a119c9dda537648a084c62a532c45619aab1a6a305707baa68`
`font_02_sfnt_off00010603.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10603	17560 bytes
SHA-256: `d98aadece23d79dfe0182332d6a9326c4b38fc3454b65c35ad854766c0a7e311`

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