PDF malware analysis — malicious · 8b2b371d35c0c5e1

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 18:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 316334ca45a1a5300b288f0c3bff8365 SHA-1: 6734ff6d616511814b2964b718ff8426f2a9329d SHA-256: 8b2b371d35c0c5e1edcdb67e078fae752eacaa9ec07c80ca3890d82e21c149e0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to potentially compromised or disposable hosting sites. The embedded URLs suggest a lure to download further malicious content, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 https://argumentua.com/i/file/bivutezo.pdf In PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76597629d---gepupizelojisubiwowos.pdfIn PDF document text
- http://www.gonouvellezelande.com/files/2831913196.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/abf2768ccb6914c75e849548c3c471ab/6689005096.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ad748d649---7338202115.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b92605b0ebab425eac3c4fb66600afe/46842351588.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf1f98689---80464104802.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/rg0v5capreme7jh9ht0ceekpgp/vufevajoduwezuzoju.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964787ec8f0---63397208426.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609293a426531---noxovezewixiguruxa.pdfIn PDF document text
- https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/on9m39rk5es1a2m4ms275tb712/32746250504.pdfIn PDF document text
- http://razaviota.ir/basefile/razaviotair/files/mipizozoleg.pdfIn PDF document text
- http://werkkledingverkoop.nl/images/docman/files/39114544615.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e6dd79a55e74bdc269b854641dde5d9d/tukevenabukipogudo.pdfIn PDF document text
- https://alice-immo.com/userfiles/file/584280721.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad77a038af---24712969727.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6edeb915c---jaretibifoba.pdfIn PDF document text
- https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/31d28b4c6babc9b9ec8b4a539b042704/monatefakajuvi.pdfIn PDF document text
- http://reanda.com/jingkelun/userfiles/files/20210604030536.pdfIn PDF document text
- http://hatowo.com/app/webroot/uploads/files/pugizemat.pdfIn PDF document text
- http://kfbi.ru/content/file/bijiferifunitadawoven.pdfIn PDF document text
- http://alphasigmaoverseas.com/userfiles/file/67199374694.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d860967c4a80dbcf2d8a037874ffe5d7/losaguzitelizebajemov.pdfIn PDF document text
- https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/bd8e525e37prk6cu1nl70t11ds/nozilenalakolexabesixo.pdfIn PDF document text
- https://gelblighting.com/userfiles/files/tapexefonowatow.pdfIn PDF document text
- https://isabellepieman.com/userfiles/file/zatadopuf.pdfIn PDF document text
- http://briarcliff68.com/clients/71184/File/gerodimimunonaponorisurow.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48c377613---93674769744.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pdf+recovery+app+for+androidPDF 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_off0000f766.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF766	17544 bytes
SHA-256: `babdef5c9e0bcb696c700c19bcd0a9f2eab93d1fa1cdde55a81a8c43ee25dc50`
`font_01_sfnt_off00012516.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12516	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013d2d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D2D	10480 bytes
SHA-256: `ac6c0dbfb71c868c8760073e1730008392b413e87db83bb8375d2c2d6b303be9`

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