Malicious PDF — malware analysis report

Static analysis result for SHA-256 b398f33a166435d1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-14 15:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2ac6510baf447cb3e028005c63cb37f4 SHA-1: f7407f425f063c1c5213e9d6537f6f3cf3eeab49 SHA-256: b398f33a166435d15e8395de289562e6214f321df7f4eb69d1956d7800d1e6df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=video+editor+for+pc+windows+7 PDF link annotation
    • http://macautemple.com/userfiles/file/gowil.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/31157814759.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/zuduvusibexezutivof.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/joxopanojebisafenu.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/68629831996.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/23658395341.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/95833889066.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xilowob.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb1f7b9e2---36053047196.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/digukitugegumimovakirixi.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/ketokup.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/70032253332.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/sosagadisogati.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6c48d32b---benuwis.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/39207584d974593f84c3797224bc3e96/lukokogewumunisisopilup.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/44052779550.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/lobukatutojakibuzopubalo.pdfIn PDF document text
    • http://medrea.ru/upload/files/jolonefofepofokinoka.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/nisituzedabotokedi.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/89246566377.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091214540170554.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/migokesixawelosijijilulov.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/togemitupikaxaxoto.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/romumebovegofin.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/35948541282.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/47804958764.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_off0000c3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D7 17264 bytes
SHA-256: a21d484c0391bf9d99097f0e0910ff22be9c4a2743a1d948cd05ff5c40a149e9
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 10512 bytes
SHA-256: eb067a629707afa91c8dd82fe3a8aa4c4eff0878d044a1d530ea8e2767f348d6
font_02_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1