Malicious PDF — malware analysis report

Static analysis result for SHA-256 0364ff80651d733b…

MALICIOUS

PDF

116.8 KB Created: 2021-09-04 02:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b41402805e1e95122b2bb25eb730b7fb SHA-1: 6ded9e804b2767f4a78ed40a1fa80580f829ad9b SHA-256: 0364ff80651d733b1587165aadeeccbd4d7407e2ec232b219c9a7d7e6f746a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kd-council.com/upfile/files/gonarigegaxevimexafuguwap.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4751da81---13409275943.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/pokilolevomosoni.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608be88217fcc---zeses.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/ravomurefopudo.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/6285885001.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/jozedigarumixupoguzinu.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/17/98321157741.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/52227336517.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/74453148707.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c2830a723---xiwuxitipefixa.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/45476146277.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/gabilug.pdfIn PDF document text
    • https://area5srl.it/file/pizijosu.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/52857840562.pdfIn PDF document text
    • https://w4gw.com/file/87274660692.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/pujosokowesulotevuzulamad.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/9759546611.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8853c999---fizezapejo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5551714399987a9a68d2d04f8ab1ca89/saxenev.pdfIn PDF document text
    • http://remobudostol.pl/pliki/78440433559.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/83480543444.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/75732528768.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-24/20210524145717228308.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161199e2cb21b3---73160830595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=seta+alessandro+baricco+pdf+gratisPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/15b5c12c4e9bcb4d57c7c31e3d566fad/difilofakarexedo.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_off00015de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE6 20108 bytes
SHA-256: ef28eef15a55f47daadb2ad084ad6214716031e9d87e1cdcf746b6d78be31cdc
font_01_sfnt_off00019380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19380 11012 bytes
SHA-256: 63ed8f61cc5320fd9ab28b42c7ba2fc4e2207538b66438593c5162a7d3fcf0c5
font_02_sfnt_off0001acbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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