Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa85335bb40ac70…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 10:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bd5171c0aee2443c3c0ae8693cda641 SHA-1: 8642a1cfe3cf3149d55a3e01489b686e2d649353 SHA-256: bfa85335bb40ac702cdc668982a6ccd101dca79133272ce168fab138dcd97fba
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS upload storage and disposable hosting. The presence of a 'download button' heuristic further suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=vector+free+download+apk PDF link annotation
    • http://kidsjeodo.com/images/files/sofivepube.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/70969266016.pdfIn PDF document text
    • http://bubb.cn/up_file/file/23186482488.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/likasifasizinu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7ccmchk9i5vfu0tro5mnolkqc2/pamesikopigejupusi.pdfIn PDF document text
    • http://rvhifi.cz/files/file/jilufadumanik.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/fedunufetebamowefudu.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///36175984202.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/88730556628.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/86865369582.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/refuvafat.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/pikibaxobapovovako.pdfIn PDF document text
    • http://ymmicro.com/files/files/64402883728.pdfIn PDF document text
    • http://proart.by/media/file/29858820079.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/fosusujoviwavawijow.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/jixodemusokezexida.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6d5063e08fd34a1bc67656cdce98d068/15132178073.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/rejale.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/28509673757.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/87014990233.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/47778322383.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/24691026134.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c65825694---44550174430.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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10500 bytes
SHA-256: adcd89dfd695f19cc1e593a80f2702178b5e277e0ef1ba55fb2f743f30a95bdc
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 19484 bytes
SHA-256: bbbb1f729be4ce44516fc270340e0416e5f6b064f1ed55593cb82ea20beb6bf9
font_02_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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