PDF malware analysis — malicious · cb43240e67daf350

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 10:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: cfd455859eaf088c071e96ccac2f6435 SHA-1: ca7e76d9113282f0a35a1be96989bb33bd7bfc6b SHA-256: cb43240e67daf350fff67714f01f15dbd6c20d682ce8970dab2fbc9d8f47a36c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics suggest it is used as a lure, likely for phishing or to download further malware, aligning with spearphishing attachment tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vorjvaitb34smr8dm2uv9sqdmv/94949985758.pdf In PDF document text
- http://ssujaxchapter.com/clients/83257/File/83567667786.pdfIn PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/roisdb1e7tpsbmrv9lsqp4nrv2/4292585929.pdfIn PDF document text
- http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609440c05ff36---284504808.pdfIn PDF document text
- http://broadviewlibrary.org/uploaded_bvlib/file/75561875877.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/09d9ea96cffc01971a57c9b9e5ce7be5/nufirorig.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084448e8b638---82383104737.pdfIn PDF document text
- http://suamayin.biz/userfiles/file/97610191904.pdfIn PDF document text
- https://cape-electronics.com/media/file/4860882298.pdfIn PDF document text
- https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e447ee25---13234538846.pdfIn PDF document text
- https://cargoservice.pl/cargoservice/userfiles/file/vusipidedopepu.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/46cf1f6ab2ddad21f0a7ddf50ba24cf6/45824396181.pdfIn PDF document text
- https://adlinefor.com/home/webagen/public_html/korn/data/file/71659323071.pdfIn PDF document text
- http://novussiteyonetimi.com/uploads/file/60790983283.pdfIn PDF document text
- http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed0fc6c12---detokatosuleposudoponev.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8178d1cab65423a34513ae5e2add0c7a/luvotumogara.pdfIn PDF document text
- http://gachbinhduong.com/upload/file/90810101936.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc528dde3b---27584683730.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b849d9b0a3d---kunulanevurabagapo.pdfIn PDF document text
- http://shukokai-voves.fr/userfiles/file/52887345659.pdfIn PDF document text
- http://dnepropress.net/files/file/16566022932.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa8109c74---45566087675.pdfIn PDF document text
- https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/if2l62lje74mr780us7cuu7hb7/48822467781.pdfIn PDF document text
- https://coonvalleycc.com/userfiles/file/xuxewa.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bc281829a5d---9660107784.pdfIn PDF document text
- http://svx.su/ffile/file/xixapigezumemoles.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3897342d5b82b7e42256411d99030f45/zumavefubibugelu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=capitalize+months+in+englishPDF 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_off0000f065.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF065	17044 bytes
SHA-256: `4e99cdeb524efe302d501038946f8ab5bfc62d403b20dd83f3b58477a280d624`
`font_01_sfnt_off00011ca4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CA4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000134bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134BB	10692 bytes
SHA-256: `22e161d6747dd66ebf3053196a9d576fb350c7e6ddd792068f84c60c1c3a34bd`

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