Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c8678b6a17a2a2…

MALICIOUS

PDF

86.6 KB Created: 2021-09-17 04:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fbdb9e4330512cf3cb937068fd82bd2 SHA-1: 84784a26d2f026e5a5a102718b9fe758088594ad SHA-256: 72c8678b6a17a2a2746954b993bca53acbc7b1433f85161c3390ff8aca5c04f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lqqes75cjhmce9ji168kv65c41/tizizinufejiwofuj.pdf In PDF document text
    • http://ugyvednok.hu/userfiles/file/44111319261.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/94342601888.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161367ec800298---kutatoborevu.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/megitep.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/zujajodilakelijuxula.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238e9dcc42---sawokimasetaxa.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363c5b838b1---93183226770.pdfIn PDF document text
    • http://xsteelstock.com/d/files/56590151306.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/bojikisajowub.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354dde99862---xoguvut.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/gebugekavagow.pdfIn PDF document text
    • https://satesayap.com/contents/files/fovifotin.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/54875547778.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/zesovuvazitebovesofup.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/dowanuferenetulujuxuz.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/rixifonufunoselogemaj.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/ruzefafuvakejitavamulabos.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0eb0u52cqik2f46cl5fptmgc65/tovogejexulaga.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/zivudadiso.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-16/20210916022503743464.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/66016916152.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/40482753835.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/vevuvafegaguxibizu.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/buzojejaduwajopevax.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/vutufitiviwakizizufevew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=where+can+i+watch+akiraPDF 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_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 18688 bytes
SHA-256: 0e3232af1a5d8d7a4f912408e990a69d3d36a081ecc528dd11d0271eab720b82
font_01_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13621 10164 bytes
SHA-256: 4b153702b22da7b52c3ddd1c8580e130110911365788f46fcba614ed817c38f8

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