PDF malware analysis — malicious · 7e31ca31fa193847

MALICIOUS

PDF

81.4 KB Created: 2021-07-30 15:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 819587617bfa4ce75c3a8356d33faf5d SHA-1: 94e76018256de155c4f9271cadba01d67e8d8c96 SHA-256: 7e31ca31fa193847785a4fba486999b922bb586668a4f61dbaa0c425a4c31ccd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of these links indicates an attempt to direct users to external, untrusted resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://eatorhours.org/e-bussiness/fckimages/file/92701960057.pdf In PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071abb50a107---38369608668.pdfIn PDF document text
- https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/f0200jkp8r67fmnkr1r5a0hq5u/sikezevifugobu.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/821890c8d7a7cc2d88420025e7facedd/33576786232.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b291bddb660---9224682121.pdfIn PDF document text
- http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9dd27e2c3---tuxunap.pdfIn PDF document text
- http://babamoleskine.com/files/file/45304840752.pdfIn PDF document text
- http://getem.plfiles/file/goresivixi.pdfIn PDF document text
- http://kutscher-customs.de/gfx/userfiles/files/banige.pdfIn PDF document text
- http://ubest.ru/images/file/85580140796.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074761f56c99---gadovoripexelifuti.pdfIn PDF document text
- http://dermaktif.com/imgup/file/busirogorutaxewob.pdfIn PDF document text
- https://biorenta.lt/ckfinder/userfiles/files/muzagamov.pdfIn PDF document text
- https://menu2uplus.com/images/file/tidokuzusarud.pdfIn PDF document text
- http://zbraneklapka.cz/ckfinder/userfiles/files/49045612267.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/576e126515796a7ac8e1711aa48f44d5/berazozodokoxesavo.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609648dac5017---zolefis.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/j8qs3fqoijdlvp0tf61mi99nlt/jarol.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/oqsmms9dr3l7r3o8k9biuikcfl/bepelasenibarozusasime.pdfIn PDF document text
- https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/sldpofuiv1d01kjigkktu9r5ch/49551037654.pdfIn PDF document text
- http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1778eb91---49391946196.pdfIn PDF document text
- http://bc-arman.kz/ckfinder/userfiles/files/73127436939.pdfIn PDF document text
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/q7pdrdbrj703onp5gokjd4ld91/55275899329.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd260e8238a---juxomimepivababu.pdfIn PDF document text
- https://petala.gr/userfiles/file/bigux.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/jvdf6rlad26ei222t3dr2u7809/60752464434.pdfIn PDF document text
- http://chinahongji.com/d/files/94064363869.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=high+level+and+low+level+design+templatePDF 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_off0000db88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB88	16572 bytes
SHA-256: `d9a43fd577f0edbfe7c4b8517ce7d486ef278328bb2bd31bf0fa656b3d56b4b2`
`font_01_sfnt_off0001068a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1068A	10884 bytes
SHA-256: `098a958ae9d3a5cff6775a2d6afaff4c06ccb9c7e49cf5d4eb761d58e53722cd`
`font_02_sfnt_off00011f53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F53	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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