Malicious PDF — malware analysis report

Static analysis result for SHA-256 769136e0fcccfc68…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 02:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08d6cdf6ede01682cd16df5b155ee27d SHA-1: 84e22668ef179d804a603ad5849907071a2306dc SHA-256: 769136e0fcccfc68a2cf16ce4475ca25734a7f367ef19ef95d7ddafe12e6d951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://etevent.itweald.com/uploads/files/614328611d4ed.pdf In PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/mukofilurodonovapexevizat.pdfIn PDF document text
    • http://yepuco.com/uploads/files/78204904804.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/20266912590.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/99307833820.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210909080155.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210908/210908155109213921zo2sl1fxfhgb.pdfIn PDF document text
    • https://regenerateacademy.com/file/47668090096.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/63312964272.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/26220661057.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/belevisudonasupewukawunix.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/36377202694.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/zitosezokadubi.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091315373333.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/o7d96jtdpu5nbn2s1dfgdqor05/pirakibuvepapemivizu.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/1022209113.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/ziwemusipik.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/12916709984.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/77537348970.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/kupinobubanofigixu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd4a950eb5---jarer.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f295c0b8ac---tamije.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fironatirizagazez.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/wokijolakiminowore.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/20741566759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ielts+5+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_off0000c1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E1 19972 bytes
SHA-256: 51561fc184e5f719223827ffb8f2fd0a1e35a23695a87f9dffb88f3ce49ec018
font_01_sfnt_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 9996 bytes
SHA-256: 014bc8034f7000ff2ea8686b3bd6782a226c7a2e560800c704e4a64bb839b251

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