PDF malware analysis — malicious · b35ce71dd10f2e8b

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 20:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 3f802b27b474acce8a78baae20b05505 SHA-1: e95f42b5e5cdbe3ff3224a9873b432c945f79309 SHA-256: b35ce71dd10f2e8b02bc1f626a6e9285febdec67510caef66011af021419c977

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with malware delivery, likely through spearphishing attachments.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=social+networking+sites+advantages+and+disadvantages+pdf PDF link annotation
- http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5e33d6527---satewejabapalobu.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f76921ceae0108929fd0bb3f3218f94f/jedoxegigej.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160717126e9b47---duzototikijibedaripude.pdfIn PDF document text
- http://shinyoungvalve.com/userData/board/file/26854347624.pdfIn PDF document text
- https://latework.cz/soubory/79694514495.pdfIn PDF document text
- http://martonelektro.hu/files/file/raxumim.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56269395bc---sojofavuvetas.pdfIn PDF document text
- https://diarch.in/WYSIWYGImage/file/4929315681.pdfIn PDF document text
- https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0f8237436b5ee4605784cfcdc80ca4b3/zifezitutezifavatageleki.pdfIn PDF document text
- https://sweetburden.com/upload/users/files/vexigefugikap.pdfIn PDF document text
- https://hashtag.school/userfiles/file/xulurepesubamuz.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5398ea5fb1---90154248827.pdfIn PDF document text
- https://argumentua.com/i/file/walijoremogusolonogixedun.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/38bf12e6759ade57bcb6d568ce8e9297/vegepako.pdfIn PDF document text
- http://pileshoppen.dk/userfiles/file/dulevupefan.pdfIn PDF document text
- https://akproauto.net/nbloom/fckuploads/file/3738756736.pdfIn PDF document text
- https://graveyards-fuj.ae/userfiles/files/3164109626.pdfIn PDF document text
- https://club-sports.net/uploads/products/files/98117062588.pdfIn PDF document text
- http://xn--80ab1a9a.xn--p1ai/sadm_files/34755178361.pdfIn PDF document text
- http://watthaistuttgart.de/userfiles/file/59948590280.pdfIn PDF document text
- https://aiaciran.org/cache/fck_files/file/nawuxogek.pdfIn PDF document text
- http://austintownfitch1980.com/clients/879833/File/mixoju.pdfIn PDF document text
- https://ringid.vn/ckfinder/userfiles/files/78857651378.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c95392a2b---40794867466.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_off0000d87f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD87F	16556 bytes
SHA-256: `fa192cc6f847f956a69ac301d6465ab36c8875fc4c5017a87f88280b01febbaa`
`font_01_sfnt_off000102e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102E4	11116 bytes
SHA-256: `b318b0d58596e5f02fd5ff583c285fbf378dd8263e515a105c55eb201c65e018`
`font_02_sfnt_off00011cc5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CC5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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