Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45cba2b3c68ab68…

MALICIOUS

PDF

90.0 KB Created: 2021-08-10 11:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9f97de34b92d7cdd0d2f25b7b5ddefe SHA-1: 78bf0d1b31b3960709df7883862e67f130a4cecd SHA-256: c45cba2b3c68ab6893a1fdf079a3baaf666d0c0530a1dc74d6ae5b22e8f978a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests an attempt at SEO manipulation or tracking. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=frigidaire+gallery+refrigerator+parts+list PDF link annotation
    • http://global-leasing-management.com/uf/file/laparetozirologuwabedowel.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/48312483595.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16111faf686433---80397615075.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/sedovajipov.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/96270422799.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/rifubideg.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/acaa89ec9bbafa7c9b21b1ced4825d20/wijapon.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d518837f---duvakeserexaz.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/revodisasasokar.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/79638824514.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c4fd28b8---2029450916.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/zekumabuxuvavevukanu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5mv3bdvgh23vpnks8sij0p5dl2/12089636972.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/74212828491.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160807a18a03f9---ganelototak.pdfIn PDF document text
    • http://dzbnf.com/upload/file///balewimisomale.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nuvpnimnmib5ns69dqtek1a7lm/28258248310.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/tijujubalumajakemex.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/mepurufujejoguki.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba029441d20---zilawofudufigofa.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/30006335562.pdfIn PDF document text
    • https://defaico.com/d/files/3154138511.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210713212703.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/nanetulenizune.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.

FilenameKindSourceSize
font_00_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 10660 bytes
SHA-256: 3550cee04758656d428d2c2e7349354daf62ea887a2c22bbcdd0aedd380d39d6
font_01_sfnt_off00011235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 17464 bytes
SHA-256: cf71197c53d9a4a5c8caf894ad62b5efbf790304a27128c1929498f4fd347131

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