Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3453181c9dc5c4…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 19:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da90d5c4b0061952ba86ccb3c0c014aa SHA-1: 4508e07f32c18151cc5ad365d80bffc5ff9d73cd SHA-256: da3453181c9dc5c4fac690a4e06dec421bd5709cdca7785b4bed73635bb8afe7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cfb8ea617---besuxufuvexet.pdf In PDF document text
    • http://ahkjt.com/upfile/file/78152716375.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a8ffaa8d828edbe547ea5bdd5ac2f841/jazinifepe.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/wiluri.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084377a8dfa7---41527841422.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a980ba96af---90930485101.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e8da5d523---16576149571.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/26256672251.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/4059481054.pdfIn PDF document text
    • https://ivaco.it/file/47120102757.pdfIn PDF document text
    • https://foulardfotografando.it/file/22382570322.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/28911003807.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/14819773155.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/pojofamobisunive.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160edd2aa4a9bd---sobitin.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/jomagoralupexemu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6b6d5cdec8593f7417d17c4505546ad9/46691693737.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/31688361d5a28c53a79de5d387954641/57147406910.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/79617255603.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ucu62h0burdad26qje7ht7s6cj/3851563339.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b4f10e61---jegojuvogugurojeruxizit.pdfIn PDF document text
    • http://kco.su/userfiles/file/39054694936.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/fupuvij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=name+of+animals+and+their+babies+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_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 10880 bytes
SHA-256: d5e18aeabe40050a462c90fdf714026db7475eb7afc116c9b7732c36274146f9
font_01_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 17268 bytes
SHA-256: 318b6861cc374eec87a8912ff7ccafd6de5284ae0de6ee3630dee9b7c68813df

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