PDF malware analysis — malicious · 6ec7030026d98841

MALICIOUS

PDF

128.3 KB Created: 2021-07-31 08:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: b4bd041dbf4592bf9b8d37f1c639ee06 SHA-1: fa650afc38f383881ac93abdaf65c05d38f9c520 SHA-256: 6ec7030026d98841ba7e97b46b131d92b7e2c24d3bb4ee9090b599605d195f2a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9874

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://pistant.ru/uplcv?utm_term=libro+de+desafios+matematicos+de+cuarto+grado+de+primaria+resuelto+2019 PDF link annotation
- http://www.bordadoindustrial.com/ckfinder/userfiles/files/66817891420.pdfIn PDF document text
- http://cathugo-catamarans.de/res/wysiwyg/file/zibovut.pdfIn PDF document text
- https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/mlkitnpmkanpka9f8eglsebikn/21222025639.pdfIn PDF document text
- http://instant-image.net/UserFiles/Site/File/vezubi.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a396d381a46---57014302102.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ql8lu2goujeacth8du4un8oquc/xazijaliwunojedog.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d45eeb1c---dipukugobopov.pdfIn PDF document text
- http://sea-cruise.ru/ckfinder/userfiles/files/ziwumajabizowiwi.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/08dc956ca15d74d707ffba7dee70de8d/muxig.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5e9cb79fk51cra7sebkjio6kc/26986559942.pdfIn PDF document text
- https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c422f246fd3bdbc28ca9be13dbe6b86d/wuzanuxolugixomobulonum.pdfIn PDF document text
- https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2be6525e3e1be793faa62db8b7716ff0/71115484431.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/56csd02ech746d2ad5av1sejee/dowaxeroxubal.pdfIn PDF document text
- https://www.aukuras.org/ckfinder/userfiles/files/75943666069.pdfIn PDF document text
- http://assushop.com/userfiles/assushop.com/file/74849571176.pdfIn PDF document text
- http://prosquash.by/data/bugavivez.pdfIn PDF document text
- https://fl-forever.com/upfiles/editor/files/kudilesi.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/be32a7f18873602db8cdab1342e6a135/78311481051.pdfIn PDF document text
- https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/g8s51ff3t66bsjrf4vebckc9ej/kibumirezupurifotakar.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/12332875151.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1204276494d704ed3a2e626779291875/71034487515.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c495e25a1b7---89023912725.pdfIn PDF document text
- http://abwingscolley.com/uploads/files/vurefewifo.pdfIn PDF document text
- http://viewcs.com/partner/upload/dextfile/30832191122.pdfIn PDF document text
- https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/435d39a548fd69249afd9cc5f53dacfc/litoxari.pdfIn PDF document text
- http://hondaotohaiphong.vn/upload/files/vepajasidugonaputu.pdfIn PDF document text
- 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_off00018929.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18929	21232 bytes
SHA-256: `4ca90efe5615a0d48ce819c886a27b23b82637424f6a0d17dda4dde80c72400d`
`font_01_sfnt_off0001be40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1BE40	11516 bytes
SHA-256: `2f64eb4a39496227ef286ace43ebe41f9637cddf7e9c5db8d6e8b7b7d32c2d16`
`font_02_sfnt_off0001d93f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1D93F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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