Malicious PDF — malware analysis report

Static analysis result for SHA-256 236820bf09e5865b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 16:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8604f5e99d1ded6ca8ab89a1ab43a8a SHA-1: 26d11d66d86aa374f62a6be62f88457aaa41c4a3 SHA-256: 236820bf09e5865b7675e387dc4e6e6e8b7ad8d8515dba23f794cbb7101f9fe5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of external links, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=continuous+tense+worksheet+for+grade+5+with+answers PDF link annotation
    • http://sjhrz.com/images/upload/File/bamezapadota.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/53969711603.pdfIn PDF document text
    • https://pr-dienst.ch/file/tumubutajatefiwel.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/93093180612.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160de9e3e6735c---jitafuluwekitadun.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/perojodamedijojezol.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/moveduwiru.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/280139193.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/wexivo.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/xojofaf.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/9010159614.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a947c56d32f---92732547278.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611738513d76d---74498914082.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210821034907.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/42963778650.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/16778043947.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/bitumavupaga.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfec5aa691d---94248808942.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/319f5af69de2c87e63d27de5c8bc78fa/kotasuvagamexanek.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a62b00d0f---95078462986.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/94486262562.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/tagibufidojopuxaloj.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8225869562---towelosugikidike.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/10f745997554fbb1dc956d03925d28c6/82570407274.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_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 17472 bytes
SHA-256: 540c7542705baa13e4a97704de774b7cb2e899d92c05af3e51af80699dbe3b6e
font_01_sfnt_off0000feca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 11028 bytes
SHA-256: 7f6701aea3d385db1e9fc3f55dc525bd1b31a0fc8f6509960f53d5e6a6360a8d
font_02_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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