Malicious PDF — malware analysis report

Static analysis result for SHA-256 74eccc0b5e0079df…

MALICIOUS

PDF

72.6 KB Created: 2021-06-20 03:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 420db1469c57f98ab20f4cbb492691ed SHA-1: 165157113801f115fd4abb937254d08d556f2463 SHA-256: 74eccc0b5e0079dfeab2f8493e172b55b94c36198fda88cb0276d705a8c7cabc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true malicious destination through multiple redirects and compromised infrastructure. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=sri+rudram+namakam+chamakam+pdf PDF link annotation
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/aamh3dems3jr3en93oap13j1qp/1810272204.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210618052658_1906192529.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0331d34ea---25556465703.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/naxatinukapujonovik.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ca475e59a12740fc09dc6dadf49e4c7a/jirudida.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos/%5C/28188554679.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/th284c1ujh2ecq2sjn8bkd2093/patijem.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/dodap.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/752904c48813557412359ba462faad03/30151709216.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30bcc24deb484c4be316c29eac223aa0/23201920541.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b432b7457f3---napikekoxiwawegiwujori.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/lbd34nmllc4m9e7qvs218kv3s3/zutawuwoliretofa.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ba0dd145---zonetuxadifewuvemamu.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/nuxokidotodu.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081201e612fd---paripibemeg.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c97de3eabc3---34516578658.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/16143146200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD72 5352 bytes
SHA-256: 0f2e1a8f4e96d5fd3a66181c9db3da9f47748a102744ebee32697737c755106a
font_01_sfnt_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 11328 bytes
SHA-256: a667e5f80da1979c57e157d9771ff13fef7c34e4ff74febf6d233d1d75d4f98e
font_02_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 8804 bytes
SHA-256: 9d088852c6cc0d4cd64e6129883d278e08a91f034369ca408962b75264bf7cfe

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