Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a134061f2c20eb…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 13:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecd681faa0c5dbf73a7c7da08e65712a SHA-1: 1f102aa8af76cc99854a7ff2413b957754c8c345 SHA-256: 31a134061f2c20eb7784f63fecf7c2766386b64c59674fa07b1b2ceb8c6d8ca0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://synerhu.ru/uplcv?utm_term=ml+battle+points+hack PDF link annotation
    • http://printrun.nl/userfiles/files/fupudifofujekutajofogiz.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/48698094015.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/bupijikowapuv.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca55d6c70---sixenod.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/59504132021.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/taninutuxejimulazanilola.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/vaxuwidaxet.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/96794951214.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/38350660709.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/xidab.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/goxujebadaxotodasasa.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/xexivatuxilodug.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/dizuv.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/rezugagirukez.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/76942440114.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/baxadarenotixab.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/doxedudizokugifiremaviz.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/36454453304.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130302254cba---84106490883.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/vilanitudegosogi.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/8a175efcfd27ece07ff8db84ba02b3cb/tawosokigadubafup.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/dowofotusufitijetukesot.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/99888949656.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/7942096496.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/porowopodepunikesudomak.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 10596 bytes
SHA-256: d2013437eae5a72cd6afdeb74972ebca0da405c64175b799a6678ef023e0e997
font_01_sfnt_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 18380 bytes
SHA-256: 9b6521fff6c06210dc6224a4408f691067409829de5c4288c4402913e93495bf
font_02_sfnt_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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