Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9489292ca55d50…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 09:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7513484a21980976a19d7d9a964bd72f SHA-1: 3fea5942d68043ae911f3b58ae05757c5592e357 SHA-256: ee9489292ca55d507b46eeb5343d7ec7eea54ed8ab29a82cc29cea9a4c150850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=identifying+fractions+worksheets+grade+2 PDF link annotation
    • https://foodphotoshop.com/userfiles/files/wulewodivikoxuniwezokek.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/9oba9smtmfk8vi6d74rmv41akk/27293466808.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e29dd4385---zudiludegenexufulaki.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/lsmifoj5iuvn3rapbdfesaqbd5/65692896137.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/82608760786.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/6845827401.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/63322438772.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d4b6455c90a71a4ff531276e1ec6376c/85836196681.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/rokaz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d363056a76---goravusoviletamojeremuvu.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/sosabepanozuwenowaxenato.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608700c5127c2---sozusaresisamanadigob.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085c11c0b7c9---12552295371.pdfIn PDF document text
    • http://weingut-suppan.at/files/jakusa.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/35567542200.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20217141151138611.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c5ddd1c9a916d2c47fb779859a16f143/rewofewarezojejamex.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c99f98a74---96055927802.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/jedopeketaro.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fb1b4a038d4e4ca286f207212dc201e9/75232368365.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7dcd5b6cba501063921e9a617c38f8d8/xapimidudisox.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/bagebovixazesapemuse.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/96939018345.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa903c65bef---xokodegukanaxikovenodudov.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/93447743370.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_off0000b57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57E 11072 bytes
SHA-256: 3b1af7e373381543591a6ccdd2881e1c3c75755b378aa7cdacaba6f02bb82bdd
font_01_sfnt_off0000cf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2B 16440 bytes
SHA-256: 95a8691ad729614d3506764984983a83dac38b9794c9bfc84dd2e4151d697bb7
font_02_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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