PDF malware analysis — malicious · 5288482655937e23

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 16:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: dcd92027b7fedd521d8333f4693118bf SHA-1: efc649abad9320915fdd1cc58db262d8f42bd62c SHA-256: 5288482655937e23cc855bf26b384ae5559693789b73067971ac0c91bc42ff22

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search results or distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and an ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest it may exploit PDF vulnerabilities or serve as a lure for phishing, potentially leading to further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c0ca52fadeb23b5adf1a4af56dc9ad4f/zitorodolojofeluzumal.pdf In PDF document text
- https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7659f0013fcbcc8ef02a052e5aac5848/14425965187.pdfIn PDF document text
- http://klasykarozrywki.pl/public/images/fck/file/mejusopirusolukujizefu.pdfIn PDF document text
- http://agro-partner.com/Image/files/pejapefi.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a4b32ad81088f21cf008dde5f7054962/xulifatol.pdfIn PDF document text
- https://majubesar.org/contents//files/terelu.pdfIn PDF document text
- http://ahkjt.com/upfile/file/89722233279.pdfIn PDF document text
- https://residenciasanamaro.es/userfiles/files/xezivojeliwakalododisonuv.pdfIn PDF document text
- http://mispuntossaga.com/campannas/file/xasoje.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16116666c64f41---57562747499.pdfIn PDF document text
- https://homestayhoian.vn/uploads/image/files/sodelobidag.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873aad55b3---zabunolapilut.pdfIn PDF document text
- http://hongshengfish.com/uploadfiles/2021052308270967256.pdfIn PDF document text
- https://hotnews.md/upload/userfiles/files/lamixikubajakomo.pdfIn PDF document text
- https://rarahil.org.np/ckfinder/userfiles/files/tejajufuzobudogojede.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f5e53ca1---mamolivolaravotajelesa.pdfIn PDF document text
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613530736315b---3267855531.pdfIn PDF document text
- http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/18662311239.pdfIn PDF document text
- http://allseasonsart.com/uploads/fck_uploads/file/lejijamole.pdfIn PDF document text
- https://chrmglobal.com/userfiles/file/pumofixogesurazeno.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094a5831ab57---6948427258.pdfIn PDF document text
- http://margheritango.it/userfiles/file/7832363425.pdfIn PDF document text
- http://cinstech-inspect-survey.com/fckeditor_userfiles/file/500193274.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa1526bae7---11637476611.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e643b4795---rukadesog.pdfIn PDF document text
- https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/45of7rogshaoo7bqgp7d461g2d/sunexigapapozavab.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tommee+tippee+manual+pump+instructionsPDF 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_off0000dd4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD4C	17864 bytes
SHA-256: `30b3736e5e053b28e58cca6075aa2f94cf3ad06f1155d0f656b5bfdcc66295f5`
`font_01_sfnt_off00010b6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B6D	10600 bytes
SHA-256: `0a4c246569cb7dfca70b9a84c85534cefbd305e0ab59c40bef1e6f4635ec9c72`
`font_02_sfnt_off000123a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123A3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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