Malicious PDF — malware analysis report

Static analysis result for SHA-256 914f917aa8140ab0…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 16:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e1c37239bfcf01b2f185434cac0d0e44 SHA-1: 42818a6a3098a974a90634b1c7ed85e836ab2e30 SHA-256: 914f917aa8140ab0001aeafc8f80afd935435fe30a78a4dcb8d270c02cbf873f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and heuristics point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://gyermekhaz.hu/Content/site_images/files/41949204700.pdf In PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/nevejabazetinodomebalamok.pdfIn PDF document text
    • https://aaaxxion.info/images/file/fulumesogutuburegibela.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/48843469985.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160833736b2c69---4556960332.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/depipulilulusivi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-22/20210522084230152597.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c1091bb3a---63938699020.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210701_A26F4BBD6F539647.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/datitifulosexurorar.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3qsic8hva8r0npfsm0q51rk8r2/nawuxejeziputewumuzawari.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/96984200738.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf36a7ea4c3---begeberodurone.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/a8m9kshn1urqptvafm74mcvkr5/45763109329.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/81297be90318d256a1ef7f3995d3be05/19418174393.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/ketatufatidixumeliwi.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071742f1dbab---zazisolabokemovodaze.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad292be0f0c---21089143168.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d8a656b8---95111958089.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/59195670372.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/lebofikumene.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608872d96ad55---zogawuzurowut.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/62469249568.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/pesajovosepadixutije.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/fojafeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rechnungswesen+grundlagen+1+l%C3%B6sungen+pdfPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000bf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 11084 bytes
SHA-256: 20b7e6111b2c63fa70a65399e1dbd3441b99466b77c6929c1e9668324eb44ee2
font_02_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 20444 bytes
SHA-256: 01c12dd9da6f9604eda6a37ccc50b694ff3800c0ad150880e5456763899c315d