PDF malware analysis — malicious · 5ea4b0810eb2ec91

MALICIOUS

PDF

83.6 KB Created: 2021-07-01 15:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 74a9f7d247c7f66c0ee52a005ef3f082 SHA-1: a53c917a8e7f55f7468d1dcb8b5e5dbad67a4891 SHA-256: 5ea4b0810eb2ec9167bb5afd199bb73de70a269fc9ee9f1d99b52ad7ec727e15

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of obfuscated content and the use of compromised CMS upload storage further support its role as a malicious lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffea1721e1---pejemuxanazimep.pdf In PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606c9da1c370a---mafipapewikik.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bda458d9db81b1ea245823aea1f54a82/74766769262.pdfIn PDF document text
- http://provia-events.de/pics/fotos/1/file/89218236528.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8991782a4---risekuluri.pdfIn PDF document text
- https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/83nu57t7qn8bs6h59872256vq4/16162451845.pdfIn PDF document text
- https://abe-rdc.com/userfiles/file/6226023194.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/48490c4dafd66181bc6110a381038dba/vimupomodowudidizuxi.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ada161f2d---7598934563.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-5-26/20210526160932323819.pdfIn PDF document text
- https://ppuhperspektywa.pl/files/edytor/file/25427769435.pdfIn PDF document text
- https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/e0bff06d42ba5f4c0bc2798554772cb5/wugusadezomusi.pdfIn PDF document text
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160830d8f7d1ee---ketegojebilifes.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d9eb98ea031e3d440bae12243bb3471d/74038321187.pdfIn PDF document text
- https://benqmusicworkshop.com/fupload/file/likomutapezozoporubodeve.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d9a0e7cfd27eb5d15d5ce67105376673/64544161502.pdfIn PDF document text
- http://aaaexpressac.com/userfiles/file/vabifer.pdfIn PDF document text
- https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/41ac4618046e0da9ab3e5f3a718f20e8/66739126519.pdfIn PDF document text
- http://www.alexgis.com/siteuploads/editorimg/file/2729136186.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d227af3bf3---63689975826.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b6661b8c3a86d4d6068369fb591fe76c/11829327619.pdfIn PDF document text
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jagb9basdn63uu8104rh05d7ob/83892264714.pdfIn PDF document text
- https://equantumconsulting.com/files/files/81236594961.pdfIn PDF document text
- https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/453bee306a5b4b75ff8b552f11bc25de/tisanotubigi.pdfIn PDF document text
- https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c566e3b9d53cb407c65409d72f8b071/82456168524.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa9f5a870---63189974351.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pain+in+the+back+of+lungsPDF 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_off0000e164.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE164	10848 bytes
SHA-256: `ae2d8a87e67f1599c8381c331d0c028e4b4f47c062d35a31c8b1a486c04b4015`
`font_01_sfnt_off0000fa61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA61	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011273.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11273	18908 bytes
SHA-256: `13540f8f0c087254f5460d39565905f40754b235fb4f9b927e23295bcff278be`

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