Malicious PDF — malware analysis report

Static analysis result for SHA-256 026d8f2f7058b2f7…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 00:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3269af5077b7ed3f8d2330b47b5ed6bd SHA-1: 868f0daf5b0abccaf15ad40ec044e9a703c7c5e4 SHA-256: 026d8f2f7058b2f7e99d4a16a35dcd88fe542e03581dd19b7687ca52c324e5c6
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The primary purpose appears to be facilitating initial access through a phishing attachment, likely leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c27c3b3fa9b19dd0b39ed3a6c7d1352b/18817003918.pdf In PDF document text
    • https://supermagnum-bg.com/userfiles/file/fepixetexe.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/xabibobaniguwixipowenuv.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24a41b9c7---wunepat.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/6c957aedeba6352bbc8a242d5fd49a43/38372679271.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/pajugusilatopixijujesoguk.pdfIn PDF document text
    • https://12tiga.com/contents//files/20876914381.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/85954443577.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/t9imq2l4ct3ib0ls5vq13iuos5/8757541765.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/33228226633.pdfIn PDF document text
    • http://getdol.com/page_data/file/nuvaw.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/18693529276.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92925f2ee---51706312700.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/33207392906.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/68540167831.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/danijufowuzetazo.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/68948662704.pdfIn PDF document text
    • http://lejuriste.ru/files/file/dofujupufebinewagak.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/39197636280.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/27219124752.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/bifijuxigikike.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/virevomerap.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/64918270111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+mechanical+strain+gauge+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_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 11244 bytes
SHA-256: 68b0313bf66914e0eb2efb821e48edc2f09897a23f5847b2fbf2eddbae7180be
font_01_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 18448 bytes
SHA-256: d2ae9a580b05280d03b96f32c397cea37d1d3a31841f46dc0c45e57d245cf626
font_02_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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