Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0016b1c26aea0a6…

MALICIOUS

PDF

93.1 KB Created: 2021-08-22 14:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c88066af6118d1a68b21f4501670114b SHA-1: 461e5da90fd965f657bc7427d3f0cf7df1abb155 SHA-256: b0016b1c26aea0a625b68502c97c828572930317a28588b9177e3e9a2a5be4aa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting other PDF files. The presence of external URIs and the nature of the links suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=the+man+who+built+america+episode+6+worksheet+answers+quizlet PDF link annotation
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8ab9ab688---54415915121.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b179d33857de0a36e28243e6ea0939e7/vemik.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/dabixilivolakewe.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/931f829db102c37a1b81580c410f5b86/24967948391.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f971e6d3c6ba9e04f21e1a3105c320c8/22889533682.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/kalefuwerer.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/boledemad.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/75056543203.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/rofarimute.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d8114bcfc---25608726600.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/meferuwajixi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/20a82835b21b24f32443b0017c05d325/dariziresaripa.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/38b1d59eae4cb738f4dec44ac2d09049/97849239517.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/841489eb981286666c55af917a94af29/jopix.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/23914749414.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e736ed16078551dd23f2244422cd7fb2/35380517421.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27bc9d3df7---fakob.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/bofomoga.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/robogipoxap.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/50112875896.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/48963596672.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/45764818203.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/saxuxewikosazipasa.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0fe0da4ce04377c6e903686b224420bd/83578161469.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d8488001320b9dcc272a47133e10739a/4881810405.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/5fde71122b2bb3a5790e86efbbc94041/lewebujanonavam.pdfIn 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://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_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 11536 bytes
SHA-256: 50d278556a2388e2032453507bfffab4ce2fb7705cbe0d2805b5ca6d0fa98d9c
font_02_sfnt_off00013713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 17308 bytes
SHA-256: 22d3c6e28b71f9f7328b7b3a7ecbfec4b55cb4a39abb382dae41305abe1cf681