PDF malware analysis — malicious · 8cb62cb0cc672dee

MALICIOUS

PDF

72.6 KB Created: 2021-09-08 21:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 2c1b7c77a81f4fc7e667d6da2033e0d6 SHA-1: 0a96e71b73cb1d81a357f440aeaf300350dfffb9 SHA-256: 8cb62cb0cc672deeef6cf3e1ce6ebd7cf296495b4c1cf0341f3a2274eb3f3848

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, redirecting users to various external websites, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9837

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://philabc.ru/uplcv?utm_term=manual+soundbar+jbl+sb450+portugues PDF link annotation
- http://vsrru.ru/userfiles/file/87284581268.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613789b6b5e07---vozafegigibevito.pdfIn PDF document text
- https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/44758548699.pdfIn PDF document text
- http://newtarrytowndeli.com/uploads/files/fenoxorowuni.pdfIn PDF document text
- http://fotosvatba.net/userfiles/file/24814571299.pdfIn PDF document text
- http://alpinist.store/sribati/editor/uploadfiles/pugobebo.pdfIn PDF document text
- https://goldmenu.com/userfiles/file/radutogukotubokatopus.pdfIn PDF document text
- https://lodoshosting.com/calisma2/files/uploads/tizalosaw.pdfIn PDF document text
- https://envida-nieuws.nl/bsb_website/upload_fck/file/nasokobemozizulideged.pdfIn PDF document text
- http://hoanggiaphatstone.com/upload/files/duxapopa.pdfIn PDF document text
- https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132617f352ef---42546732008.pdfIn PDF document text
- https://a-guskov.ru/uploads/files/pizavawuwadupido.pdfIn PDF document text
- https://mmgrowersg.com/ckfinder/userfiles/files/dugigawotikibozexuv.pdfIn PDF document text
- http://fibertechnique.com/tmp/file/bilasixexatifi.pdfIn PDF document text
- https://juvelyrikoscentras.lt/Files/file/dugupavumurigudozusive.pdfIn PDF document text
- http://elpijisystem.com/file/xelaxam.pdfIn PDF document text
- http://stmrcstvm.com/userfiles/file/zonoziferaka.pdfIn PDF document text
- https://aradovan.com/userfiles/file/visegegazapokisifapose.pdfIn PDF document text
- https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a6a2f632265c256ec00061bb0afa9907/vujakorajewopuzivijeb.pdfIn PDF document text
- http://rotarycochinharbour.org/ci/userfiles/files/siluwixolibexepo.pdfIn PDF document text
- https://osiindia.org/ckfinder/userfiles/files/32243423089.pdfIn PDF document text
- http://spc1991.com/ckfinder/userfiles/files/61051409621.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16133f019ce9a5---63692110727.pdfIn PDF document text
- http://automozg.by/upload/editor/files/gapizefizagegelom.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/214b1058ff9d7d2d39ce37643f3231f2/vetufusaleliladosimubuse.pdfIn PDF document text
- http://neboskreb-irk.ru/uploads/userfiles/files/betekojugomedazat.pdfIn PDF document text
- https://datenglagi.com/contents/files/gawotopedakibima.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_off0000b441.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB441	17688 bytes
SHA-256: `a09ca3bd4b5add7cf6feef46a288ae82817994d0661b4007febca7678167833f`
`font_01_sfnt_off0000e11c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE11C	11172 bytes
SHA-256: `f1604a72dd531243c4d043272be05db8ec6cd7ac2bcfc878e72d5ad3bc95029a`
`font_02_sfnt_off0000fb06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB06	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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