Malicious PDF — malware analysis report

Static analysis result for SHA-256 2241de501f9ac71c…

MALICIOUS

PDF

78.3 KB Created: 2021-08-27 06:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfb3d16814a64a66f82287b153290cfd SHA-1: 501e56f889d5307d7c004b578a6d95ad61e0c83e SHA-256: 2241de501f9ac71c9c1d58af7a27e5fad03815828d57ff5b9361befdec0eb9c8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm for malware distribution or phishing. The presence of external URIs and the overall structure point towards an attempt to deliver a secondary payload or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://chcial.ru/uplcv?utm_term=demon+slayer+movie+dubbed+in+english PDF link annotation
    • http://envisystem.com/upload/userfile/files/pujazafinanebiradowaf.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/lizokofuzugijewu.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/pevikiro.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/53398910495.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/ginixesosuva.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/jopumipi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e76439b8d903e819fcdadc4b54b99ba4/12444803077.pdfIn PDF document text
    • http://praguetransfer.com/files/file/pukavodutefo.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79780883057.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/zagufikesifivirosutewekob.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/89228393744.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f29b00eaca4---federarev.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/29706202414.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/37017037177.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/suzanavapipaperime.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd7f843c4b---wepam.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/suwunu.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/bukeref.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16119994b983e7---35778627100.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/telajewitototoludosene.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/kirokebujaxogitoruke.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/99414154171.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/zagetefedijir.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/43277118207.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cc850683---88027446500.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_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 11016 bytes
SHA-256: 830ebeb6444624876a034d0b29d09b66337222b537071fd2b4f09fdd39a6d0b9
font_02_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 17440 bytes
SHA-256: c0a9bee64d0ac4670409c018279ca99ca86d1438ad002f26f9ad0403deb222a0

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