PDF malware analysis — malicious · b3a265d74a79df6f

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 20:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 2b1ec9ac5655d9d74f390c20428488eb SHA-1: 950fc4406b1353dbed1950b14c356922e12be321 SHA-256: b3a265d74a79df6f0919061dc27cb8e47a6df59b690582ac2bff3d2d35dcbcd8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress upload directories and other disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous unknown URLs suggests a broad campaign to lure victims to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/18in3q8uvttj9dbadk7r717umo/xobugamus.pdf In PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6162c740cbd60e5261681135f7195c2e/61966831625.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/92852557319.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608100cd53703---botinevonefumonaviziz.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb49059744b---20723456988.pdfIn PDF document text
- http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecef086493---36294105498.pdfIn PDF document text
- http://bfr-bialapodlaska.pl/userfiles/file/34391123062.pdfIn PDF document text
- https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/rss20aurkv3c0dsg4lddbcg1oo/muxezaf.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/033595f951f68aaf384e745fa75e5066/woravevagufirodefiliwizav.pdfIn PDF document text
- http://grandp.ru/userfiles/file/75040021987.pdfIn PDF document text
- https://webmenuplus.com/images/file/midemidonowixifexamukano.pdfIn PDF document text
- https://fceresources.com/ckfinder/userfiles/files/jovuzikupitagofubiriwali.pdfIn PDF document text
- http://jobsandhi.com/uploaded_files/userfiles/files/37266297602.pdfIn PDF document text
- http://fresh-j.info/images/uploadedimages/file/49192406937.pdfIn PDF document text
- http://efuegypt.org/userfiles/file/43682693308.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9c6dd277b45cdfbd52e08b1f2063fe69/pajinabin.pdfIn PDF document text
- http://amirafouad.com/uploaded_files/file/vulobivapanuzun.pdfIn PDF document text
- http://domholidays.com/userfiles/file/97701797355.pdfIn PDF document text
- http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a45de80d---82428196412.pdfIn PDF document text
- https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bcea13db5fc300a2234bc4bf08b1adf/23351793207.pdfIn PDF document text
- https://hosvagyok.hu/userfiles/file/60355236748.pdfIn PDF document text
- http://geologicatoscana.eu/userfiles/files/kunewegifeba.pdfIn PDF document text
- http://sakaryakasaplarodasi.org/userfiles/file/46772878997.pdfIn PDF document text
- http://studiomalpocher.it/userfiles/files/41637343820.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a078b9571d5296748d774e058fe5fab6/28966225838.pdfIn PDF document text
- https://www.tvmreza.tv/ckfinder/userfiles/files/pabopagamitipuwa.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=online+change+pdf+to+docxPDF 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_off0000ef8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF8E	10756 bytes
SHA-256: `4de0c66fd9c4ed390c96c9d1154ffef5d4e765defb9a6f554b80e8e6e8c12d5f`
`font_01_sfnt_off00010807.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10807	17208 bytes
SHA-256: `7dfe29da9a71068108de40b5dd57dc722e301122afc8e4995b9c24d30cae8675`
`font_02_sfnt_off0001346f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1346F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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