Malicious PDF — malware analysis report

Static analysis result for SHA-256 39230c31150b85c2…

MALICIOUS

PDF

91.2 KB Created: 2021-08-14 12:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c5dcd84ff1aea6a1097be7c7ac9874b SHA-1: 73b9595e5fd98eda2b8555ce02d02192114ed463 SHA-256: 39230c31150b85c231a3b2465a164df2b0001bd0b072c5ec35dbe949dc7d3bfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2bffe839c8621a41c53bc7d0e153e2c2/30303115767.pdf In PDF document text
    • http://instant-image.net/UserFiles/Site/File/pixaxerigaxulizomem.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c1d9198a643d9724e8ab067e296ceee8/lamegegurujazi.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jmdaiplk401nmcn9vg9lul5ia1/94161157883.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/64bf44c5392a9520507fd04b9e5c7e6a/tanibarolej.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/legidazisisogugivizurisag.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/506936239606b91dc2d7ee8a5766661c/27790854397.pdfIn PDF document text
    • http://immopolignano.lu/images/26129348458.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/riwisubidudabogogijiki.pdfIn PDF document text
    • http://web68s.com/upload/files/xodupatijasiwomu.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/xodikamiguzaga.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ca4ab9107---37348697158.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/27668684995.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/13449759940.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4e89761a059d8789efd1f88f110a9012/xelinasirabesibefe.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qimu03r8ukcrn7agoho18inock/ledewitilixejedixol.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/reziwujukiseloned.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ffp0e1jrdvd873vio1011i8t5/68233235553.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fb1e78f34d23ec5804c536fb850fa131/57379492139.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b5adf1c767c81d313adb78f5c8690b30/jarimuwonutanuziguf.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/t15alts9srk9uatmn6plftqgnc/7753344733.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/dekulokizowufutazowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=exercicios+de+vestibulares+sobre+figuras+de+linguagemPDF 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_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 11208 bytes
SHA-256: e912565d86c74e428d82de5114fc98a811115395f9bb0e87e9ce0219263f8d35
font_01_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 19392 bytes
SHA-256: cb13d7e96b9ad2a7de22447475e48c0e7ef9d2d0aaf98f5d22ca79e40bb0e7c7

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