Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4bc2552afab5ee…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 06:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58d01f45c5633e9c5fee428e7284f129 SHA-1: 842ea7d59f52c628c9ee23566ab14bbaa8070681 SHA-256: ab4bc2552afab5ee33730498a4b062b192bd8aa53c820d7d1e7649ddd86d621f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the PDF structure and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://studiolegalebisantis.it/userfiles/files/mevofurujogozufigaxov.pdf In PDF document text
    • https://tckontrola.hr/files/18075824596.pdfIn PDF document text
    • http://ymmicro.com/files/files/67798231345.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/64760564064.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/55074042075.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda395fa11---wokixibedanev.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/6844398887.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/gefupolapov.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/vizikuwebofozewuxira.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/sidiwabesalazufa.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/42171439275.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/ligonabavatozivikudoroki.pdfIn PDF document text
    • http://japhina.com/upload/file/jaxaragij.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/96694619860.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/294330a17156723499844a6464daf925/jugifulukizuvofo.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/92976252105.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/woxugumasajuxifajufike.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/18405919553.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/xopigexi.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/jusugekodoze.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5a0e6862---nudasukafenaladisisulu.pdfIn PDF document text
    • http://marljivo.hr/UserFiles/files/14021183407.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/14391272938.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/masekejetujudijob.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/70392607592.pdfIn PDF document text
    • http://toroisg.com/public/images/files/govegukusef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+have+2+snapchat+apps+androidPDF 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_off0000b857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB857 14844 bytes
SHA-256: bbd33306df121a3c8a267de57574b8feeb59679929ad7f9670dbd75dc8ea1679
font_01_sfnt_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 10828 bytes
SHA-256: 5f69a9fe98db4eca81da3bbd867f2173c8fc433d190e688749ba5a18fde52f25
font_02_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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