PDF malware analysis — malicious · 8c8b41f37cc5908e

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 01:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 15a2ac017affa608370a6752d7f6287a SHA-1: 01a54a0697eee0e5d84c5b29d04dff4131a302ef SHA-256: 8c8b41f37cc5908e1e7aad292f2cbe99521e5c0e5a110fc596c6ffb6c45ab48a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these external links, likely as part of a phishing campaign or to download further malicious payloads.

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 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://x-site.by/upload/editor/files/golareladovozupoken.pdf In PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607021b0ece05---buxurew.pdfIn PDF document text
- http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb269c10e---44405960821.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/sja0gudmtiqbjd350ekn9bpe2g/7621714169.pdfIn PDF document text
- http://brenderup.ro/mm/file/1235990049.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3db3c20c39f75eb026bb4f2c9e2ded7c/98258514168.pdfIn PDF document text
- https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/t44mja1gbdln3oer4q97mlpp7b/jekiridi.pdfIn PDF document text
- https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0d603d290e5eb707a62dca9c058f6273/75078034391.pdfIn PDF document text
- https://jasz-pap.hu/UserFiles/file/56437893544.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/35e3ddd26f51639cfc6dd459c35ce5c8/20934497192.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/eac11b226dd24ff9d46c88562ddd21d8/sagijilijetunijepijen.pdfIn PDF document text
- https://kristinanamaste.eu/files/zowaxurawaweluvodowiwenes.pdfIn PDF document text
- http://theofficefurniturestore.com/ckfinder/userfiles/files/96679050255.pdfIn PDF document text
- https://whatproperty.ng/ckfinder/userfiles/files/50496942213.pdfIn PDF document text
- http://bukharajohnscreek.com/sites/default/files/file/kidikig.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9df98d9c7---65770298616.pdfIn PDF document text
- http://e-district.org/userfiles/file/3776982087.pdfIn PDF document text
- http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/fagizixanasukejel.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/78b7b5615715b03eeed619e95546ef4a/zovesimiburaxunukelulufep.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/o7faqth354gdscp73trvd3upnk/64196559861.pdfIn PDF document text
- https://mb-classic-service.de/userfiles/file/29157123379.pdfIn PDF document text
- https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160730e44e3b38---10814652781.pdfIn PDF document text
- http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bazofugotesunofarizi.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b7c1372da---28955428238.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ecuaciones+con+numeros+enteros+pdfPDF 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_off0000d074.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD074	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e886.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE886	19196 bytes
SHA-256: `5d24dd564e68b5b07a4f77c97e14ba6c005d305ae8b16d902460fe2e01a587c8`
`font_02_sfnt_off000118f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118F8	10816 bytes
SHA-256: `b7ebe6757b9a66772bd8bf7ffecb33b566394b2c0814adb3a3de2f9c1417252c`

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