Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3aed69cbcb6359b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 20:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 38b72e28b0167e5f9e44ad0523b4cdf7 SHA-1: 0e7ff5b19775bd03e25e352a45c29431e34d4f75 SHA-256: e3aed69cbcb6359b9a1fc64cc144efe070722ff169f03c2a4dbb202c4ee15414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous URLs hosted on compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

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 http://hotelborgodeipoeti.com/userfiles/files/nibuniwagolofodifimalos.pdf In PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/52334671096.pdfIn PDF document text
    • http://www.depomatrial.com/file/88895606156.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/99323607605.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b7a069d8---vulatiw.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca669468a---fidesiluxedufosixuw.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce27cb515---motusirakokafilume.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/89038053145.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210909030735.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139717877417---maxabojefivobir.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/92314073173.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/38695783532.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/kudopulosefajok.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/57681176951.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/68932081091.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e450c149c---19522155523.pdfIn PDF document text
    • http://flirdining.com/uploads/files/guretugimoderawalaririzu.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/kigokaxifuwonikabevolabi.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/xepukitepoganog.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/lutematozeporeg.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/08e153b56ca89ab22f6e1a818b35999e/lazuterowekibajigixa.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbea57976d---kelupizegavufomiwuj.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/74560422948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=nasb+bible+download+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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 17972 bytes
SHA-256: 1dca580e673e096ce1c387ec135c1572e8e42e126192dbf78361bd30af1e3119
font_01_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 10496 bytes
SHA-256: 420ddc978a13dee4eb9a1d6b5fc9bc4b32300e12b32b6d280479519c0ccee471

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