Malicious PDF — malware analysis report

Static analysis result for SHA-256 48398e55e0499b01…

MALICIOUS

PDF

88.8 KB Created: 2021-09-11 01:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 956427390cbaa83e16a7bea29df9100d SHA-1: 08dbb71294bfcef5ee7bba7d140d29322d023d82 SHA-256: 48398e55e0499b019c23fbe224d3bfbd4221c03a4ef221939d48c371c35d8fa5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 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://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/vepevogoxojelelejek.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/s2btpo8j3em3oajjem9m4d63li/pezetazotoxani.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/wipanipodev.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c2ef795143b36319bcffe79fed799b3c/nizuvabewuseziraxobex.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb47b1695---35813671533.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/widiporibixawagelup.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/lakenajepe.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/14535431804.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/23406180513.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/batubosologowokilobizeme.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/73797253291.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/negip.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/sesenujaluduzewom.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/linusixekawigevufenu.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/sakisifevuxalavepemiwan.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/dipunovux.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/pawoverifixulorurakoke.pdfIn PDF document text
    • https://jobtiara.com/files/files/burifulivimegotujezesofu.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/37364738083.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/3717162082.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/luwonixikome.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/gamamedorodijewesewev.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/lemizivofe.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/10c49d8e933f10e78d061273605a226b/mowetawemuxulomivoralafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+telefon+yaz%C4%B1+tipi+de%C4%9Fi%C5%9FtirmePDF 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_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 11168 bytes
SHA-256: bf6f2e0d2838c7a8fceadba0dbf3364355a81cb24a37611c776721458a987eb0
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 18496 bytes
SHA-256: 8f6f77385a6b2e63a482ac855f90b477f90142a3302554e57047224e1d28b178

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