Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d1761fbce6fe99…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 13:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e44885491187ac802236fa5006a45e7 SHA-1: 8beec4da26d22fd8e4638710394a0d2d30489140 SHA-256: a5d1761fbce6fe99010df71fdb13ddd5286ca3852b835e608a2dee329e8a5299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, 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 embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://quanhoangtsi.com/upload/quangtri/files/93051209890.pdf In PDF document text
    • https://kolbandibileklik.com/resimler/files/84765074201.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4g9k7tkr2vt9u38rqkikkbvgai/sakogodokivanutemabur.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b50b8c1ba---wuwufolepiwevif.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/j462ck5qq8739adt0u56ehuud2/jagudibib.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/93adb6f63b3042fae6c58f33bee2b30b/81422688181.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/22964351944.pdfIn PDF document text
    • http://hasyo.net/files/file/mirug.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/8e3fe638b5388a899b323b0c1bead2c1/fijunadezawix.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/vazereluponidomitipuji.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/45885247010.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/wavim.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/70660970161.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/jidorawejejidan.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/95750908519.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/34765244465.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f410785416---mododaraf.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/koribu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cabb7e833b03572494cbb03941b8353/pijofefetofuvo.pdfIn PDF document text
    • https://profesa.net/userFilesfile/wevenuzefidulujeg.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/makuwifusuzufenina.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef1cd7bd9---bipaxuzugarevasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tables+math+worksheet+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_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 10848 bytes
SHA-256: 86359ddb3984e8e72c44852036f600f0e8abda7267401e99e71fcba246c244d7
font_01_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 18200 bytes
SHA-256: 704808ad095608bead11bf9545fb7da5176c61a979f5d5402ba335b648af48ad
font_02_sfnt_off00011804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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