PDF malware analysis — malicious · 8b892888af203a6a

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 19:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9ae6d8b98d5905b0d0fea5fefced72d7 SHA-1: 05bc35536837c109703159d58324d10dec212181 SHA-256: 8b892888af203a6a05bb79ad8d0be83ec1161656bdbd26c8c8d9d4be4671c902

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites likely host further malicious content or phishing lures, consistent with a spearphishing attachment attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7bbst09r89okhsbpn38b1rhd0/20308703777.pdf In PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086205b05073---67684734132.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abe65c5ab---jajufirunorivifegewoneg.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb081e81a---jubibewugomimadepij.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b7e5d853800b160bf750b9fb82fccf1/lelus.pdfIn PDF document text
- https://maximatrimony.com/ckfinder/userfiles/files/26113536507.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23e62c58ff---sesotem.pdfIn PDF document text
- https://cvsc.co/userfiles/file/91733369717.pdfIn PDF document text
- http://k-yoga.org/file_upload/spaw_upload/file/20210510054558.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0ap8oqakfdu9r6kapp9v8gebp1/genurakogapubix.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073c8ae5be79---11465663539.pdfIn PDF document text
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160811de28690d---43078344488.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d61de8e8---dajefokenafepemota.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b74567d7ba9---mawaxamulazisapo.pdfIn PDF document text
- https://eqonetech.com/upload/userfiles/files/62662838757.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9ac92090a22daefeb3d407c73e7e55d4/10094725717.pdfIn PDF document text
- http://fitnessklub-impuls.pl/uploads/assets/file/wazapazesijofapofatiziton.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbcb33d2e8---sakivevunumejuvose.pdfIn PDF document text
- http://phantasos.org/userfiles/file/sipami.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7735e7831---zodiregesuduv.pdfIn PDF document text
- https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/829d77cbaa5dfe07ffb6847c427ed8d9/84298605071.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23b4852ff---wiwutabuwujev.pdfIn PDF document text
- https://f27szerviz.hu/upload/files/kujefopuwowubakofomu.pdfIn PDF document text
- http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/a04b44b4dc9314ad674dd584aa6abdf7/jizobexobomabemeg.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a4af0d5ae---lepawobekagetozidukanedu.pdfIn PDF document text
- http://marcelponjee.nl/ponjeefiles/file/resar.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=reading+techniques+and+strategies+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_off0000f822.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF822	11024 bytes
SHA-256: `866d21155671faec566895843f8e83c4218a723873c2701c8ac1ae7c5d73e199`
`font_01_sfnt_off0001112d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1112D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001293f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1293F	16960 bytes
SHA-256: `a537dbf30b42122e063eb99fb044f8cd9db66a8760c08a5f94e1432e8f91d74f`

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