PDF malware analysis — malicious · b2b2794fd7e98d26

MALICIOUS

PDF

117.8 KB Created: 2021-07-05 13:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: dbd6fc24c04428d484a6280f3c5d96bb SHA-1: d98c036def5546a68c33a9676bc2118e9949134c SHA-256: b2b2794fd7e98d269b62fe5c1cbd4cde8b2430c2a342d24adef0bf6d950b23c9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, with numerous links pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to the download and execution of a second-stage payload, aligning with the typical behavior of a malicious PDF dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9870

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://allnatureint.com/userfiles/file/4874738728.pdf In PDF document text
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a34404f67---febiwegemidimibagaguseno.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703b75c85e8---41326331021.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b663ed0e60c7e46f757acfd84b10be73/lovuxabibeduxolefidisosor.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/i4s338mv12p5crdf7i2hbbke57/2570533083.pdfIn PDF document text
- http://ristoranteibucanieri.it/userfiles/files/mixeloporives.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4419fd5a249ce8bbf3b755759459dfa7/koponimurixodumi.pdfIn PDF document text
- http://ankaser.com/userfiles/file/xujusivanabiw.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d321649e6f---53439853841.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a624aa9a994---62111337370.pdfIn PDF document text
- http://savalis.ru/userfiles/file/5781533835.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4dd240591---53074197238.pdfIn PDF document text
- https://arerp.kr/data/file///neduzomugolakirubijuvuz.pdfIn PDF document text
- https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e8ac02ecaabfda1f0ca2b43dd6e680d2/gixapelememigurotix.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608203ff4871f---88903650051.pdfIn PDF document text
- http://harposwebdesign.nl/app/webroot/files/userfiles/files/datinopaferukaxesezexoj.pdfIn PDF document text
- http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dabb65ed6---wegekexekizaxagupinis.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767fdbed374---81070023841.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a9c8a77fb0a49572022e4bb07df158bc/45146568180.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/efcc2677e57aadf766ccf4fad78ff888/titemu.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f73e6ac6fd---lafoxesiluturupaxurugetok.pdfIn PDF document text
- http://tznjl.com/userfiles/files/77432326154.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b428997a51e---98305351666.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/61690924245.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30239dda2a---xonajinamuzesifa.pdfIn PDF document text
- http://vtaky.sk/media/file/dujikozurumotozepamiwa.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/09e2000c8f8607d91720b687c7aa5cf6/66725397942.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=central+sulawesi+indonesiaPDF 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_off00016853.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16853	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001806a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1806A	10456 bytes
SHA-256: `d6889d81163cd94c5480ed7157ba43e9469c60840a0bb47fcf3438109debcd54`
`font_02_sfnt_off00019858.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19858	18156 bytes
SHA-256: `4dd285307211c817c0a440bc82f416efa7da30d56e8b1b1efb7bbac70fadc4b5`

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