Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1da2dae2f7db256…

MALICIOUS

PDF

80.6 KB Created: 2021-07-05 14:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 756ae53a678c41e6d62cb24029bcce2e SHA-1: 21c6bd5a973587d35799b80e9c18115dfe405179 SHA-256: e1da2dae2f7db256fea18bb38a4d88c52287e31ca5efe34c27ecb4a2fbcde61a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qfi8c48ppb6eg7vblp4gkbdv74/39721980634.pdf In PDF document text
    • http://www.ecostroyservis.ru/File/34423952923.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16092e18af0836---80124462194.pdfIn PDF document text
    • https://longhoang.vn/upload/files/bugikigovojamibiwis.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ec76176a9029c7a699ee832478692aef/guwujan.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f866b1448c245063ca1777497199861c/28872340046.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/12483383833.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/xosonoxedet.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078984d1c914---55051746809.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e5d8cb69044c7edd6e29ed03b54ecc8e/sazijowafoporibu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5778546a34---89171428969.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/49986309864.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184a10563d---nakuzusaw.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/bejokivi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/236f2a9706384475b9616e1bf60c3740/70748572544.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/946c0f86964e471910cca72bd73e01ca/5362856872.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/potex.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2284a1de---suboveromesigiku.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/menedevemebupobitem.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59444df44---vezubokitewipuzirufupowet.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/derefodawebipuzokofikokej.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bba54760a0d412873ece4270e1dac49c/95422309780.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c2a99805---32870767654.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/js1sq9nr0uj78pffe4ldkhmag7/17251805837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sgr+law+firmPDF 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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 10096 bytes
SHA-256: 2b93eb2ad05de82854a39cd14f97628cc649a58d88f9ba914b87a0288d2f3d59
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 17836 bytes
SHA-256: e493e0f679eb483e7f66be550ab461b859552f9c49af57419cda32b953936a32
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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