Malicious PDF — malware analysis report

Static analysis result for SHA-256 467594e2bff0e62d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 03:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12ca73db275fd2ca572f6fd7dcf00bb5 SHA-1: c6dc17d0d9ab7add69f5fa36b673185dd9d4092b SHA-256: 467594e2bff0e62d2617c65c3b13ef97e7f4bd294f903cb98baebb180104c86d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF also contains numerous external links, some pointing to compromised WordPress sites, suggesting a link farm or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://vgi-vn.vn/app/webroot/img/files/buximisotimobodunusubate.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/zuranetu.pdfIn PDF document text
    • https://bor-diing.com/upload/files/vudakepimoduxunik.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee71d4c36e6---voxafemafozu.pdfIn PDF document text
    • http://tochalco.com/uploads/files/49911306794.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074cef68c2d1---wanijuzisumupo.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210624123756515.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/54rkcd5ve27votnc464v0c11f6/kozufexopimonufowabipaj.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/97065975133.pdfIn PDF document text
    • http://iltorg.ru/upload/file/takiwiz.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/lefudogalit.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fcf7474e7---89059027611.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/12720174534.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/kgadct8anpht9mag71q584krn0/waxifenobasaviraf.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/54938634372.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/noikcr0obrevpft3mf5itoi1d4/mopuzisawog.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/48454789928.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/91089561461.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/e9flfqc1i9g3v2635j4b7od0r4/fijojipazowalabokijanedu.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/bufawaxen.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c7605918131e016db5d95c8005cfd7d5/28767157655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wound+healing+time+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_off0000c198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC198 16628 bytes
SHA-256: 363cb7b923f921b3b5967e6fa83f5e5fca7cb20dd6c329e2a6ee39f9dee8db81
font_01_sfnt_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 10768 bytes
SHA-256: 932f379eb63a76d3526b5f29ad15e3805548aba42c82ff8f46ed0480b01284f2
font_02_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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