PDF malware analysis — malicious · b60a2ef33b26e99d

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 17:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 43ba01ae1e499f016acff9d41b0aec86 SHA-1: efdedad4384da3a12f13f0fa7325da26aa02d139 SHA-256: b60a2ef33b26e99d1a7733e9ac04d2d0c4430b6db7f970e80ee76e52077624ff

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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 http://nepalbestcargo.com/userfiles/file/refovoxikepavidigidenugid.pdf In PDF document text
- http://sattosushi.com/uploads/files/juzetebesorisitaxivoseva.pdfIn PDF document text
- http://midesignvn.com/uploads/files/rematova.pdfIn PDF document text
- https://vietrocknet.org/app/webroot/img/files/35835194857.pdfIn PDF document text
- https://www.champagne-cornevin.fr/ckfinder/userfiles/files/nifepalipuruzujebixebo.pdfIn PDF document text
- http://copingconversations.com/userfiles/file/5951732427.pdfIn PDF document text
- https://optimuselearningschool.com/learning/site/images/uploadfiles/kopivarav.pdfIn PDF document text
- https://weishinclinic.com/uploads/files/202109021150273928.pdfIn PDF document text
- http://esipro.be/userfiles/file/faturu.pdfIn PDF document text
- http://dhleisure.com/ckupload/files/fedanamo.pdfIn PDF document text
- http://nano-vip.com/ckfinder/userfiles/files/46211321725.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161315b9da4cdc---43014314315.pdfIn PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e774a3d8d9ea3254a91f087cd9429c89/jadoposegoxolovuxapukipa.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/272228d645a30e521c90c63efe570b63/xenasizezovitimaw.pdfIn PDF document text
- http://doorsatyrau.com/ckfinder/userfiles/files/xipuvanokejo.pdfIn PDF document text
- http://akcompany.vn/uploads/userfiles/file/piwabititekikopulo.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9f180e08---87762223381.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d28d64eb8---92907069916.pdfIn PDF document text
- https://valenciamaids.com/userfiles/files/8320829099.pdfIn PDF document text
- http://www.prctech-th.com/ckfinder/userfiles/files/zuwawozij.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133974933551---sorabud.pdfIn PDF document text
- http://bouwbedrijfansing.nl/userfiles/file/34300332446.pdfIn PDF document text
- http://pfmconsulting.org/survey/userfiles/files/fudodadimuxage.pdfIn PDF document text
- https://medosojewellery.com/userfiles/files/miwezigolopoxulosi.pdfIn PDF document text
- http://zamokugrofa.sk/admin/fckeditor/file/17895539326.pdfIn PDF document text
- http://webinaris.blog/ckfinder/userfiles/publics/files/73509153169.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sway+office+365+loginPDF 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_off0000caed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAED	18128 bytes
SHA-256: `465d503e86ab9496e2284c53c8e0517280963c4043d1c0892b12b885951f9552`
`font_01_sfnt_off0000f9d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9D3	10892 bytes
SHA-256: `47c5b1192ea2cc4e67fc482782d4b4246c5365a7dbe7086f0984d14a64f16af8`
`font_02_sfnt_off00011340.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11340	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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