Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e33d2d9032526a4…

MALICIOUS

PDF

86.1 KB Created: 2021-07-07 14:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d8df4c3270a6e8ebdfafe69ab02c350b SHA-1: 6980454647c339eb1d512fef86f9131754fdba19 SHA-256: 6e33d2d9032526a4de26313e067f2e0ad8a89fdbcea35dd7bb6ec3e73e95823d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised websites. The PDF contains numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pistant.ru/uplcv?utm_term=mike+rose+i+just+want+to+be+average PDF link annotation
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/87785138905.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/nanibadawesitupevovitofo.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6e4cc4ed417ea392d062a1e0311a0ab3/79390979865.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/84181005893.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/palavu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072026604784---rimixorimevudevazesav.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c507ca5b66---gowuxisexubu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8c4457cea---ginomurulemad.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84854bdf9b---gaxoxavedamo.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/58796009332.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/88296c668e1dbc1db3cb397db05fbab3/lomiruterobuxamimunas.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/5571345248.pdfIn PDF document text
    • http://ahchala.com/img/file/11136452418.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/orl6duvhbaje3cdbg2sspn2tgj/65331876300.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/52834586072.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/53133232526.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/81754412480.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/fupubetajife.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092b72f57cbc---82776655438.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0nm1u3reip57lflgae2oodp2on/topomokedefozadidujajagix.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/12407226671.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/52456330692.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160be76de5a0fc---19544839069.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_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 18224 bytes
SHA-256: 20a689dae3426cf77d44c06709a02a50c1fac3edd97ba997b10c619d5ae898e3
font_01_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D4 10844 bytes
SHA-256: ae45fd0bede9f4e4f6830d2881182a72a716b6c9e3e7d74abd4764e4f9909e5e