PDF malware analysis — malicious · 5f9cd1fc2d196573

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 17:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: fba0e250b7062b91c533d0c3a243a6cb SHA-1: 4fcdb3c04da6328f8bae06e402a3372c85697e2a SHA-256: 5f9cd1fc2d1965733a2e0f89ecdcea59ea7838a835b266cd7af5a5180d9dac0a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or utilize WordPress plugin vulnerabilities for file uploads. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://ketchas.ru/uplcv?utm_term=is+the+word+all+singular+or+plural PDF link annotation
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7af900619---79509447138.pdfIn PDF document text
- https://tavio.ru/files/file/22175759471.pdfIn PDF document text
- http://lifecare4all.com/upload/files/vapukilipipis.pdfIn PDF document text
- http://artside.org/data/temp/file/wawotufipififuzo.pdfIn PDF document text
- https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/svan25v6dksv4613purkh6fnck/weselufezesi.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ti5v8s9jsunhvnvev1a1fc0he5/49566355253.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814067b3e1e---daporawuzetaweketepaz.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a24c42146f415fd136db2b565003310c/nozojuxufemuju.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba05001acb4---74860273003.pdfIn PDF document text
- http://nakatka.com/files/file/47469420035.pdfIn PDF document text
- http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338385f210---61977904208.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ba7bdda2dde3c5878899e85fb38439cc/74481432070.pdfIn PDF document text
- https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/af5dd01daa3e44826229fb3bfd132ff7/27298700068.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160840783e7ca6---gemif.pdfIn PDF document text
- http://banghetretruc.com/media/ftp/file/78977865836.pdfIn PDF document text
- http://kaowei.tw/image/files/20210607_232914.pdfIn PDF document text
- http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a83b5db8bb8---zumipuwa.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2525133686729eda71ca41780d6b56db/53154514525.pdfIn PDF document text
- http://arniestribu.com/campannas/file/85684462337.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4466596e---botumanuxodizegeduv.pdfIn PDF document text
- https://aulacvn.com/upload/fck/file/54696322389.pdfIn PDF document text
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d904d5a9b---pibefifugone.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/301ffed20df251929c4592623a8cc8a1/35669454667.pdfIn PDF document text
- http://dolphinegypt.net/userfiles/file/22261344630.pdfIn PDF document text
- http://cn-polylysine.com/d/files/65967243663.pdfIn PDF document text
- https://workinhotel.com/upload/fckfile/64230740105.pdfIn PDF document text
- https://torgradio.ru/new/files/file/bobelej.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_off0000f002.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF002	17460 bytes
SHA-256: `4ea41211269549b91996a129110760352e48af59159a1c08761c8084733ff74f`
`font_01_sfnt_off00011ddf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DDF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000135f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135F6	10808 bytes
SHA-256: `cffc1c03934fbd1f0b08cafb4fc3f5cd7c3f939fd276682863ccb742873bb02e`

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