Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e4cf0bb0fed270…

MALICIOUS

PDF

96.1 KB Created: 2021-09-05 14:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d043f6040e53cf1eb5e1a8954afd6f4 SHA-1: c21b69a1c31a58b34aa1841ec86f8e417b292b22 SHA-256: 37e4cf0bb0fed27061b5c4a9316fcc1671323bf0c7f60373480e2e647f87a4d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to websites that appear to be compromised or disposable, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and embedded links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://dui-antidote.com/images/userfiles/file/13275605646.pdf In PDF document text
    • https://drosamahetta.com/userfiles/file/sogiguxudozenejidowub.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/36643301294.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gm8t2j9td6jjs4e9vpfu7l3g63/wojeturipusejabasizurak.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/61520293348.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d3ebbe05f97e987980810fcce47b8fa0/lisoperakarufox.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/juvazifapeloxebenoxe.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/sedojasebodozufalejexi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084d75284053---88015606143.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/67533868275.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612148fa9b8bc---69389854669.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/ludedatisuvemupigig.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d83e31119---15146176537.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/velapolibemefivopizada.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/59605417034.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/vanemuritefirakimekekuli.pdfIn PDF document text
    • http://adveotec.com/img/file/52086072508.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/kodolamoroxamaroluvus.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/96095990494.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/27e94696dc1d74d0cd10381725ca3e8e/velexonemazijem.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/9695491896.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/pitexisofitubijoguguna.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/lefifed.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/1726796371.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075330fdda02---90618628102.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b308fd91---tifipedirelemepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=laporan+transpirasi+adalah+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_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 16548 bytes
SHA-256: 91c50d238a99afe8121b47c6ddb4cfcae6bfbfc04347f9d235bb479ab32e2f09
font_02_sfnt_off00015b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B46 10420 bytes
SHA-256: 64e03f5456710bfb6cfb16c061f42305f1520908df092f6ebf75f8eb96cf3330