Malicious PDF — malware analysis report

Static analysis result for SHA-256 829718ef5a2601bc…

MALICIOUS

PDF

71.8 KB Created: 2021-09-29 12:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 42bcd75782a5d2ad45e8e3b418450b8a SHA-1: 6c1f03d562c35b97ec9bd62fa58ccc6e2dbf2c78 SHA-256: 829718ef5a2601bc8006b22ededebea57236de09890e61788ad2aa59a101f212
164 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS upload directories. The primary purpose seems to be redirecting users through a series of links, likely to a phishing page or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • 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 http://masterref.ru/editorfiles/file/wotixemitifunimize.pdf In PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/pixivununetaxopo.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/sexofokomi.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/totulojipetirowufoduz.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/75713972602.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/pufazatad.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/bifikorusuvatigu.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/2021920180581521.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/zuvewewekedeguzu.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/menozevejerive.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/35112494686.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kopadolibulobir.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9a34326e2---jamasuxorolegesuvag.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/27054002203.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5b72d93783459cd36af2bfe3790d2405/rowofulexusizotowux.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/nexojafaleta.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b2c8d9a4f---38769251872.pdfIn PDF document text
    • http://banquat.com/userfiles/files/20113524343.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2baf84b07d7850537cd808e4341d5dc1/50031118000.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/32008527066.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/fidetipukumososozowasibow.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/88816025010.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/duguvekubiju.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/43408610942.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/titoneginexigatakot.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/padugamadikakamuliwumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=modals+of+deduction+worksheetPDF 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_off0000b6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 16140 bytes
SHA-256: 5f800cd9d37815292c1cb4275ceae5b56952a0915b8b97fc35aa6b8e26be9244
font_01_sfnt_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 10844 bytes
SHA-256: f73f2d73406af860fd37b717c6479a9a911cf15316ec3bddaa796f90321b7335

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