Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72d7027d0f26532…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 19:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fcd43abc05c0b366eab362b00c8deece SHA-1: 162a59498481cedb16d7c3366da70180f5eee895 SHA-256: d72d7027d0f26532d0c70bc9de382a3ef307c6c3e27f0a0d098a5909519be343
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm designed to manipulate search engine results. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://thietkewebseo.com/webroot/img/files/joletusefizu.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130797c8e51a---wolenate.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/29206064961.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/07/saxukajop.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/c14hmskcgdia1i7capp3fb4l90/87547058193.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/karijumesaguzilolajekura.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/33418600057.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/21033477264.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/53063292806.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341d1839b4b---fubefasapirafizilopaw.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/vefefenuxalo.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vabepodamukos.pdfIn PDF document text
    • http://vititanon.com/user_img/files/finakus.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/82826935947.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/givolox.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/rujunidifuxawigivozederu.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/sugewomamaxiwidazoz.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kalafonu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3eceac30f8a4f0d7648c7f1ac73fd29d/jomibu.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/96538451778.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/41028792179.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/deroxufavedi.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/gegexozedemidutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=crucial+conversations+facilitator+guide+pdfPDF 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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 10992 bytes
SHA-256: b5284d5803ea481dc56f0423f97f813734ed601638114735d62b2df3b61eb869
font_01_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 18652 bytes
SHA-256: 347b71ffc50aa2dafc89fa81c64714e8fba899280ef0aa6d0b991a3907e6877c
font_02_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.