Malicious PDF — malware analysis report

Static analysis result for SHA-256 879e6e80188770a2…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 01:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da1b0ea7814ad6da9a19551f40bc508b SHA-1: 1cba0713c30e7880e2bbb4da6451bdfc6cd9919b SHA-256: 879e6e80188770a208ee67f8bdbea826741618c11c748db1824f07ce283b8f5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://drafthe.ru/uplcv?utm_term=peaks+and+valleys+book+pdf+free+download PDF link annotation
    • http://liveranigioielli.it/userfiles/files/57873343242.pdfIn PDF document text
    • http://cartopack.be/Images/file/ragurilejelabulu.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/pazifaketunamadude.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adeed293db---23445202247.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/xavewoxojajebujanaz.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/peloxokemodefazopopig.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/wudesekazobuzofibevu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16132607cef38f---bemiwi.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109052334367344.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/tijixesatakulilefu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4d1c7be5a89ccb3752cc89499a03d1e4/kesivuruv.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/91036166971.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ggpkgdvqim96tdvtt8aspq5s6c/2848843612.pdfIn PDF document text
    • http://strandedtattoo.net/file/gonepovoginuwurakagi.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0322256001630929879.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/mevamidetilapufoduzow.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/63812499288.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/sozosixarefalubibizu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4205749e---fopivalujuvazara.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/golofo.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/15244336058.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/nidadevorikuvubewiximema.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/61116629824.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/59210292332.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/zaxapogojifufuxupegid.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://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_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 16388 bytes
SHA-256: a58b0dcd929810fa82afd7cbd0df557a54b03c17c240c6aec12d4e7faea36bf3
font_01_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 10800 bytes
SHA-256: f0a40faf4c5858f95a038913141efc61fe2183cd990253bc218dbf1c2d44e655
font_02_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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