PDF malware analysis — malicious · 53bffd25c9b47997

MALICIOUS

PDF

83.9 KB Created: 2021-07-01 12:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 1ac0bdbbe29d1e43f5803875410ba0c3 SHA-1: 91e0f281d9c5f5df5846c129d53c9d838069bbeb SHA-256: 53bffd25c9b479978c2d3f3dc2d3c26cf20f2a16dd46f894bb78510be66fe9ec

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

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 http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/49267812489.pdf In PDF document text
- http://rauvuonsach.com/images/uploads/files/13978843399.pdfIn PDF document text
- https://nevisnews.com/userfiles/tuxemunilobirevok.pdfIn PDF document text
- http://korean-school.hu/hangul/userfiles/file/46016728407.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff47ebad5---497034443.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f083eaf8f8---93439788004.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97e0ba894---19559781437.pdfIn PDF document text
- https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/donl4cg0jgf780gufkc79v7l26/41912152192.pdfIn PDF document text
- http://kompletucetnictvi.cz/files/file/wolezijim.pdfIn PDF document text
- http://premium-h.info/files/files/14775805732.pdfIn PDF document text
- https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/f09b0eb63f593de8ec849647b2a83393/98482892142.pdfIn PDF document text
- https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/v75gbf95n7p6a43gdddf5i9r2s/50380932191.pdfIn PDF document text
- http://nuraski.pl/wsg/userfiles/82432923607.pdfIn PDF document text
- https://ssmavidiyar.com/public/content-images/files/33641339537.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a056146bcce---dajizonuxebepujogudamu.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982d736acd1---69802456803.pdfIn PDF document text
- http://adance0112.com/upfile/editor/file/menekunoj.pdfIn PDF document text
- http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098371247b3b---84618264432.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a359d989---25712000415.pdfIn PDF document text
- http://fotofolliasanlazzaro.it/userfiles/files/63087880656.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081e720dfb8c---sonimivujigarewimupurevi.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0a4aefff---70827299330.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adbafcec5b6---90684788755.pdfIn PDF document text
- http://dienvietbac.com/uploads/files/wagujasibeto.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5e7op3cfj80m3q048dopelfabv/58751390909.pdfIn PDF document text
- http://backupcenters.com/userfiles/file/54257603225.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=early+pregnancy+complicationsPDF 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_off0000e802.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE802	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010014.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10014	15968 bytes
SHA-256: `51469596b3678aaa7d8e31d9770cb51750d528d75507a4ea06198df8f81805d5`
`font_02_sfnt_off00012956.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12956	10812 bytes
SHA-256: `4df7a0fa9dc0883aba87a5e10dd7d2f983d52b8835aea76906ab0e6773215440`

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