PDF malware analysis — malicious · 36cc45fc2432a395

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 21:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 80983472c6a7664c578672b1b41313b6 SHA-1: fdb3f809e5a0d6c48fff1f2d1f3e7a0e3d852f40 SHA-256: 36cc45fc2432a395bfcfefe2df5795c2e1a98e2701a291353113217ad6f0c6f2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://cructi.ru/uplcv?utm_term=the+100+season+6+full+episodes PDF link annotation
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388a3d17400---jopur.pdfIn PDF document text
- http://ip-malkov.ru/uploads/files/83871360294.pdfIn PDF document text
- http://tourhong.com/FileData/ckfinder/files/20210901_EF38E1CB83B9DF1C.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d7ed90ac---6113326169.pdfIn PDF document text
- http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/ruzutofukijibusakunegi.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1675ae7a0---nojogefanajafexavu.pdfIn PDF document text
- https://tonerihned.cz/userfiles/file/22299989726.pdfIn PDF document text
- http://bjavc.com/filespath/files/20210916044746.pdfIn PDF document text
- https://medtek.vn/storage/file/kuwigiletu.pdfIn PDF document text
- http://taiwangallant.com/uploads/files/202109062217532178.pdfIn PDF document text
- https://speedwayinfo.hu/uploads/file/wizixip.pdfIn PDF document text
- https://novahealthclinic.ca/userfiles/file/72843210604.pdfIn PDF document text
- https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/fizizulanofuwajedut.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/57630226029.pdfIn PDF document text
- http://clinicaveterinariagussago.com/userfiles/files/3797783464.pdfIn PDF document text
- http://klawiatury-foliowe.pl/_data/file/8773466719.pdfIn PDF document text
- http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/46085768251.pdfIn PDF document text
- http://islenapuntos.com/campannas/file/zimunes.pdfIn PDF document text
- https://fa-vietnam.com/webroot/img/files/62466319931.pdfIn PDF document text
- http://iccarrentals.com/files/file/riwenopotu.pdfIn PDF document text
- https://corpeverest.com/ckfinder/userfiles/files/filibusume.pdfIn PDF document text
- https://banghenails.com/upload/file/5099207473.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455ef60b96e---59517992296.pdfIn PDF document text
- http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/xomakukexonutilaf.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614036fcf0ab8---nematikisoxutonejesu.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_off0000e5ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5FF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fe11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE11	19200 bytes
SHA-256: `136d3cdb54b54986cf614bdd7a375fc6ff313e782430a9b15490fcd06e25d6c7`
`font_02_sfnt_off00012f70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F70	10804 bytes
SHA-256: `3fc3185a84f588f0959c612188cf2103d9d0bc4173827b40300679367166dd27`

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