Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a32a8fd12bec925…

MALICIOUS

PDF

93.9 KB Created: 2021-06-09 06:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 110d57125c52e183278e5ffe40d700a2 SHA-1: e57fc0ca92a7854eaa820f254705c0476f4f4c14 SHA-256: 4a32a8fd12bec925b36af0ae2b4e5199008109cc245b3bebea8ab0573ad9d978
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to compromised WordPress sites and disposable hosting, disguised as a song download, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of multiple external URIs and link farms points towards the exploitation of user trust to redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/uplcv?utm_term=ayyappan+songs+tamil+veeramanidasan+download PDF link annotation
    • http://asckhn.com/acskhn/userfiles/file/fujipofu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/4254c512278d7ca079854e58fcb9d455/kikuwipujomakevanif.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/25e322e6f8f2aede980720b6726178d0/donosevanutasisapete.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b452cebbc195c7f374e4a458d5eae8bd/dopisatoginul.pdfIn PDF document text
    • https://soechi.net/userfiles/file/63802619748.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089773875a95---lukuwuripuzonurejukup.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/60852812670.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9c36036d---15800550939.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/lp9f35e10f81v7jukugte5ohhi/70594383724.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5df776055ce508df8d5fc764f60b3af2/latunitob.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/9vos5184epmuvploidmoldniqm/16943439006.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607a575cb91e4---81424833016.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/854f46a0bfcaec7a49d26566beb49cdf/29852099172.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_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 5520 bytes
SHA-256: 915befd97ed15773356dd5b6a991d926d799895e646cacba09481f6353b1334a
font_01_sfnt_off00012680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 9760 bytes
SHA-256: a0eb0a934f16025583f4de25051aaf679ae23065ebbb32c49116d9cf70ca6ed2
font_02_sfnt_off00014329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14329 10960 bytes
SHA-256: c9c94e2d70ee7c526ec23b4038cccb93fa40347f9bf9d661bce553462ac6a381