Malicious PDF — malware analysis report

Static analysis result for SHA-256 0989937f0b1fda66…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 19:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19e05498c7b4c1de915aa4b6122f61a4 SHA-1: 16f4e4bc2ec9601dd072fc50b9e111995c216d04 SHA-256: 0989937f0b1fda66e07d9ad530700621386676436f077cda8444dde3ae9e9ecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often involves embedded JavaScript for redirection or obfuscation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/or07vrk32qhn317ent5iaease6/36301046802.pdf In PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/xumodaxajuwomovikizosa.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/zizeben.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210909160657_u112le.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/33621353189.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/vazofotoviperevovakumis.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/98853426029.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/57890664638.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e35de5b70a---korajiniratapabe.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/padamopen.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/73639202790.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/52005260333.pdfIn PDF document text
    • http://skia22.ru/pic/file/33058470546.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613049b9aee40---43656403153.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/xirobifagekivufigibarut.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/mewokozifinofi.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/pogawubomela.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/amutnqb8nj61c9usq398il11q1/96204602364.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/wolexovevubo.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/37729821862.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/34631278477.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/zusoxisomawipavarokexodaf.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/sisakimataragalo.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/laredojudoniseguxabij.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c270040b52---xakejogulidoxari.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/33204203904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=free+streaming+sites+2020PDF 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_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 10504 bytes
SHA-256: 7c349efb0aa47450cb855e422991c24b4fe0b5582a41005d455356e3eff67b81
font_02_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 17732 bytes
SHA-256: 840815be1d6f58931e3348799b9b7a1304e2ce9b9220e3fe9ae85bb02202dfc8

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