Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d1437be1b9640b…

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 00:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf2619943a705303b91eac3945222798 SHA-1: 1d50eff18c82bd396bce680f6aa780a9f826c1e4 SHA-256: d8d1437be1b9640b874d58caa05af8f5100026a8c4d182cf5097f00781a84a2e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation techniques, likely involving embedded JavaScript or other exploits to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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 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://fittbike.hu/files/file/39247000159.pdf In PDF document text
    • http://thingsantiquesla.com/userfiles/files/78586338813.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/sefigutudubexuvuwupuponi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160918b4a41d42---88113942046.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/28649675202.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/somagiditufubimedezifut.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab529f3f83c---labor.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/30276922548.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/23d6910f9a6ca446f0e77ad9d6616bdc/naloferubakereziximoteter.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cgfvlcep4rkec1acuiaor04ae3/sagadeso.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c144a1864ba---vesitarawasapujufer.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0dc1285e3cb36ff0e7eb6871672b3d75/38113334712.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/fozikuzebinirojag.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/xazupoka.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/95989427532.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/56437436193.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/puzijes.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/megezurezapakij.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/gerobem.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607075f620d72---39897050677.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jegppqlrvk97bnimbbkdmcepeg/dulutofavigutatejono.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b87c95278---mufetujetuberevekoxegite.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/6204307107.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/bedirijitader.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/87850432650.pdfIn PDF document text
    • http://stasta.com/userfiles/file/5382790399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=determine+in+malayPDF 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_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 10096 bytes
SHA-256: 3281e78b9f0d3d07905371dc353860af8cbd1c5023ad599c830fc2f5ee8df037
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 17780 bytes
SHA-256: 3f143fc28597e082e0c72a21efc63281830967e4c174e3bb94f82af2e3fec271

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