Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8fec50443a7e5a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 08:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dbff0d8122ad6210cf261922226d21fe SHA-1: 4327ab7519ef1b4b6e5afef819621999204f2456 SHA-256: ef8fec50443a7e5a5e69cba7d5264a70f49c6acc6ab7cbb2d2cbf848faf19a77
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, and exhibits characteristics of a remote-support tool lure. The document likely aims to trick the user into installing or running remote access software, potentially to facilitate further compromise or data theft. Several embedded URLs point to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or establish command and control infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://centrorevisionimonregalese.it/file/78719136589.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c83696c512---rodipidamusasus.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/32512391797.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca520db3cd---80818895256.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/tubevulumapiwerazoguvefu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724e80bba02---ketoxuva.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/xepilo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a2b1966d5f---lugimopatawi.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/22688271560.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/lusuduzetalo.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/dobanoxuziluloxosijumed.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/kogigimafuvejipu.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/20085461288.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/837b5f4cf09896205fbdc6b2f6299ed4/sovavawepoxudu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/4b5ier7ppa67nviemallouge61/zitijefatajesejewid.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd6a5f5ad---68894404980.pdfIn PDF document text
    • http://mp-journal.com/media/file/wuzedekagaxasawafoduduli.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0c26483905c7fc3eb662f94967fa94f5/4531634823.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16090962c14d34---75274062755.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b367646f3f1bbfe311642dccfed097e1/83401282335.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/wixitafimosirur.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b274421d3---73150808119.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/49146367511.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/8118448505.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/98390c98ce665a0317e932e54bbe10ec/vumomusudagunepix.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/jidase.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/mesuponunaveleba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=equivalente+mecanico+del+calor+pdfPDF 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_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 17004 bytes
SHA-256: 9e6a79d23c5c85cd32a28644fffe087b56dadc8cd66bb24a96c44b2e9cd45c29
font_02_sfnt_off000107e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 10908 bytes
SHA-256: 1f47bb417dc85d997524c24a3ab4e206a54269c22b97a36b3e3a466335dc3651

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