Malicious PDF — malware analysis report

Static analysis result for SHA-256 d534975867274c88…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 06:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 703f362df107c97f86e9c3bdf37feeaf SHA-1: 906d0eb2f1ff776c78255852f2f4982b7d695ad3 SHA-256: d534975867274c88023aacec7fa876109130bd0529dd5805d91f3bdbbb226e38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content. The presence of numerous links to PDFs on compromised CMS uploads indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://woodbridgeabw.com/uploads/files/vekataganak.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6331ad7e706917dd14f667d2057f0a8c/rotekixadubaw.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b32430d3a44---zoxexe.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/18142867078.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5f873a954874dffc81047bc6f7a47e28/21789359514.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/88508161442.pdfIn PDF document text
    • http://ccmyungsung.net/userData/board/file/wubefavatewuvepupurun.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/94170400516.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/7dd8034d7697dab2b6d6440e4890f3ae/95952517292.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/disenuzigewamidenoro.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/tidumos.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/dopiriz.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/14716909105.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/batewukawalepagopun.pdfIn PDF document text
    • http://kmsenior.org/file/files/berebugevusi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce50b7769---69090103203.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c17417381c0c4879435922ab6810e4e9/47698184614.pdfIn PDF document text
    • https://bio86.net/fichiers/rotivo.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2639d6da1---bofazuw.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160720ea2d05ac---65893594564.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd071279d7---89660867124.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/99394687910.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efed707467d---93284688993.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/61484271302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=easter+mindfulness+colouring+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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 17996 bytes
SHA-256: 0f90121e935fc44544dee708e383e49c3305f986af5901f18b8d2ad0bb10946b
font_02_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 11044 bytes
SHA-256: 26ed1d37a5241514d3d7674eaff2c5aeed7c31497235cd8a501d2b4eddbe3ad4