PDF malware analysis — malicious · d7444f67bac322f6

MALICIOUS

PDF

71.6 KB Created: 2021-09-10 17:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a8e4da018fa37f92c09891d1e986bf25 SHA-1: 852326fe41e72e60a8dd6433198e1c717d6328e1 SHA-256: d7444f67bac322f655a8e1227d14cbb7ad279570e237359cd321cda5dfbef253

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, directing users to numerous external URLs. Several of these URLs point to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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 http://studioboscono.it/userfiles/files/tezezaxafebavudobikif.pdf In PDF document text
- https://wfca-czech.cz/temp/userfiles/files/84925352692.pdfIn PDF document text
- https://uroci-kursove.com/userfiles/file/51126928792.pdfIn PDF document text
- http://studioagronomoserragiotto.eu/userfiles/files/80735641742.pdfIn PDF document text
- https://thibiditrading.com/public/userupload/files/fonovujijuwifoxovimujiji.pdfIn PDF document text
- http://kaies.net/upfiles/file/65410859551.pdfIn PDF document text
- https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1fcf853555d8e90dbcc2a138af512109/pesadaze.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e692ecfb1---47049675813.pdfIn PDF document text
- http://studioturina.com/userfiles/files/dodadiz.pdfIn PDF document text
- https://www.piramideidiomas.com/ckfinder/userfiles/files/70559513808.pdfIn PDF document text
- https://protrialse.eu/files/files/bizotaxowafuwikug.pdfIn PDF document text
- http://hebakotb.net/userfiles/file/8229667078.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b579628bd2---75607417096.pdfIn PDF document text
- http://liderzy.natura2000.pl/imgturysta/files/lujamufawu.pdfIn PDF document text
- https://tabularasa.lv/sites/tabularasa/uploads/documents/files/7629790760.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613168f7eeb04---91207133589.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16137c43e21069---nadubefibono.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132515d6918a---95528091102.pdfIn PDF document text
- http://hoanhaochemical.com/uploads/files/21726487300.pdfIn PDF document text
- http://xn--b1akwe.xn--p1ai/userfiles/file/lusojov.pdfIn PDF document text
- https://renhedc.com/uploads/files/202109011210507001.pdfIn PDF document text
- http://kidneytracker.com/ckfinder/userfiles/files/51143870959.pdfIn PDF document text
- http://splhardware.com/UploadFile/file/2021090303550073499.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6bcbad45---delaseviro.pdfIn PDF document text
- http://exclusivelimoservice.com/ckfinder/userfiles/files/dewigawoge.pdfIn PDF document text
- https://lazdynumokykla.lt/userfiles/file/95264263360.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=screen+cast+mobile+to+laptopPDF 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_off0000b957.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB957	15468 bytes
SHA-256: `7d3faa788ceacc4075cae1aa3a365d13a7caaa848e87283ef5312d9bb1653d20`
`font_01_sfnt_off0000dfec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFEC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f803.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF803	10752 bytes
SHA-256: `39c0dac25cfb289d3ca26804430d53a132ab193f2d29fd633111a2f30c1d424e`

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