Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eede1c64559acbf…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 01:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca280e142619d53c92a9515b494f1cbd SHA-1: 9b75e6bfe252f992b4727b4060eb3141d921eb25 SHA-256: 6eede1c64559acbf6cb2844fba77c2eb142ce593d06e34a402631a9aa9a88472
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to redirect users to potentially harmful sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=diabetes+tipo+2+dieta+pdf PDF link annotation
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8759ff69c94d88296ff307e6e5437245/womiwogorok.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/jebosafogufon.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/wadumumusuzuvilileji.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8a786f8dba7a328e8515aa4743fa0cb9/50420803517.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bc25b57a8---bigoganig.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/gituremeruvobi.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/raxinesizuxufipifegob.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/23363940133.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/rovurutikitegi.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/5006620958.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210806112843.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210511202448.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/79994459361.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/vugojomujarinuwogigur.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/49bdf513a5bb17e555c25771ce712b72/zutixuditedorum.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/3907163656.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/tizod.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121f99f7f8c7---50258171595.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/90343863333.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210817_366EABF99B800F42.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/79acba0214cf2027d0f04655fd6e2edb/21725720436.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/vakef.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/21767263982.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/zojosujesibadamuxe.pdfIn PDF document text
    • https://ibericadearmerias.com/file/40893357328.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/62365088831.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_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 10504 bytes
SHA-256: 275708948c455d62dcef696223ab01183bf379fb7efa8b845ba8fdcadcad631f
font_02_sfnt_off00010795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 19192 bytes
SHA-256: 537312baee8b6b025ec8a13f8ba03bd889c500c82d2b87379f12996f4390777d

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