Malicious PDF — malware analysis report

Static analysis result for SHA-256 767e564c9f58db79…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 19:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f732385a00840b44efd470379f7b606 SHA-1: b8b751f2b6227f8ace1ef1b7d89cafe2ec8a7c10 SHA-256: 767e564c9f58db79f939cfd37280f0178f9e785dbe4b31ae9bdd682e855714cc
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=gta+online+free+money+generator PDF link annotation
    • https://austarpharma.austarchina.com/upload/files/71695815622.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/92025653448.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/kiruwopaxufeje.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161371a3654491---98951760690.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/72910646611.pdfIn PDF document text
    • https://deepex.hu/hirek/files/lasubaliwikopilovi.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/gexuzuf.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/57945910893.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/xedagup.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/86510489179.pdfIn PDF document text
    • https://redac.ch/upload/41495169963.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/10587543036.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/waxusosedipuno.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/nubovukutuf.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/13635281882.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wupofexexitimuwalu.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/jirosudezud.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161316e7fbb311---dezidugevuzituxaluvanida.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/71018181994.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397720410a4---72860216364.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/18757734065.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/fukebekewevifunon.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/mojiwaxavivozudomerawila.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/lijafativaziwe.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bb39d126---suxegipimavimavagutamilid.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/4886904410.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/43459940756.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_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 10540 bytes
SHA-256: 7a90bf5e1ff44b8d5dacc97e05d1f6d9e8c1b91c0d7f83df740fabe919fb6645
font_01_sfnt_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 18020 bytes
SHA-256: 8eca6cd643d996fbfb81fd09a6e2d0ef63d9bb1530b56f1826e9ef10d3f10ccb
font_02_sfnt_off00012938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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