Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4131e1405a8d30…

MALICIOUS

PDF

85.9 KB Created: 2021-10-05 10:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a449a0e7b9715e3c0e90908443c8cf46 SHA-1: ce294bd60c4c937981bcef21a8272e1c4a471f72 SHA-256: fb4131e1405a8d305b9f58448c5035d20dc7659cd8222ba0961b86b0c5c822cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure and link farm behavior indicate a likely spearphishing attachment designed to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://dogwarts.ru/sites/default/files/file/webiziguledexopetojapegik.pdf In PDF document text
    • http://0575zl.com/userfiles/file/86873846314.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161590a85bb29c---xexudogabufodesajuja.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/sinunogare.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gafuzogopiruxajerevob.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/65837517430.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/83988145451.pdfIn PDF document text
    • http://remobudostol.pl/pliki/jogogujonevebevorixus.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615154f8ea25c---78994100282.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/57618718196.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371902a2796---litunodetafovukosatalijik.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/6352015262.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631853846.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/bufinorevulaw.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/juzazadalovadikijenov.pdfIn PDF document text
    • https://begili.com/uploads/image/files/vixum.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/zuxoru.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/tejawomudesiputusop.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109230959293003.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/42460572336.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/9589082054.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/tupigikozeguvajakode.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/rilededo.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/26110442988.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/47544882987.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/sapofovakiwetube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=eng+vs+aus+match+live+streamingPDF 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_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 10704 bytes
SHA-256: 9fc24fec04f6c074697b50a13aac0ce9fb550233c1376884b2a6c852df743a88
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 19956 bytes
SHA-256: cba23d283767400044135db6f942ab9049aefb615e3de963bcd23142689e9518
font_02_sfnt_off000131f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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