Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a8f24b267f4926…

MALICIOUS

PDF

82.7 KB Created: 2021-10-12 05:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b174d6c1464c2b0c49afc29eb5c2970a SHA-1: 18bee0845122d64ef5d177ef047a1b0e8c26dbf2 SHA-256: 72a8f24b267f49268a97347ca834c6a04f79949156263782fdb85a0f145fd76a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm hosted on compromised or disposable domains. It contains embedded JavaScript, suggesting it may attempt to redirect users or execute further malicious actions. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dangkydoanhnghiep.org/hinhanh_fckeditor/file/67852383270.pdf In PDF document text
    • http://anhhieu.vn/hinhanh/file/wudatururotegufomibe.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ls7dkvhjk4fnbe0e0ikp4c0cco/88063910678.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/72755781282.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/vebodutowog.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/eqrsn6qv2dban2repobmrljden/mofitapaxesuzilurap.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/nirowakirinogozodulivawi.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/mowejozegilatezofodorudaw.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202110/file/muzomotetop.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/60386328189.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/54364817149.pdfIn PDF document text
    • http://apismorava.eu/docs/56692682719.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/fibiwifedid.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gawotaluda.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/5578355156.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/34356019963.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c3d5701c776e028d9d09008c0a3b5645/wevuvojezifizokebusas.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/15427576357.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/zezinufut.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/90405307927.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/burexetegudikokowubugo.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/vemalanunupivezabowag.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/kubuwux.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/rumudipozunuxovepe.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/vafulaboj.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=brag+and+bouncePDF 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_off0000e273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 10432 bytes
SHA-256: c9cf7ac77313fa852bd618f393bc5b19357b20b03cf7a492cfe6db35fcbea480
font_01_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 16796 bytes
SHA-256: 5b49a33ba9492f9ed75f74b8252d74d7811e88d73c12cbe4a905cf201fa12f10

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