PDF malware analysis — malicious · 25a885d6b673f82a

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 03:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 933efb7a3e4867a3cadea70f7fa4c3a3 SHA-1: 8fbfa36695fed8c826ac43f418b7818e6931feb5 SHA-256: 25a885d6b673f82a8bff52a705393e7aefbfb341a922ef6f0334bac1ca6d4948

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for initial access.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=star+wars+the+force+theme+piano+sheet PDF link annotation
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/93ad08b0e01d3287320f2648460c1535/zipefawalire.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608657911fddf---bozepati.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/nei0m7v39rd0ha69jl9kp5fa67/48177852239.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982f08b9dab---44930083000.pdfIn PDF document text
- https://hospvetcentral.pt/site/upload/file/36548637961.pdfIn PDF document text
- http://iburgisidimarsala.eu/userfiles/files/wimul.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160758e0d80907---34975545155.pdfIn PDF document text
- https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/12b6b6ba0162af358eb8175ce80e23a7/vekubixulusepez.pdfIn PDF document text
- http://assushop.com/userfiles/assushop.com/file/64349220595.pdfIn PDF document text
- https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ip67jin7iromjab8jl968835g1/gujepezigeduvabol.pdfIn PDF document text
- http://decaiyun.com/upload/file/210702052407358554ze4l8zfxkusb.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160799845c8ca9---bonimusolelamu.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd640e8aa---16376254711.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6t61bbu21kdbr5hpg68hphvh9/xudisasazetawimowo.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd00ce02ee---86173369990.pdfIn PDF document text
- https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f8be9f5d5f9e13cd051b7282a931a3d4/51599814017.pdfIn PDF document text
- https://kede.org/userfiles/file/78185613140.pdfIn PDF document text
- https://vinamex.info/uploads/news_file/riliganonafi.pdfIn PDF document text
- https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/22664f73de3420a60637d32e99983986/7023671151.pdfIn PDF document text
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c67f900c9---56070301376.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616104b3f2---1032675350.pdfIn PDF document text
- http://pc75.net/upfiles/file/1624596513.pdfIn PDF document text
- https://bahispesinde.com/gnc/veri/_files/58671544058.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/144b42889f97231ff85b2d2add5a7890/botoxaberusezadizevumo.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/monuwuwifubetoxofaxob.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_off0000efb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFB7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000107c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107C9	17956 bytes
SHA-256: `a7d62567402fa1be206ab87f049e3eaf93b1c2f0fbd5cb440215d6bf84f5f69d`
`font_02_sfnt_off000136c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136C4	10860 bytes
SHA-256: `79e57645fcc51ce6a0b3966d24a12be8e8fecd1348be3925f0e80603901066f5`

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