Malicious PDF — malware analysis report

Static analysis result for SHA-256 9854ae14b806ed54…

MALICIOUS

PDF

94.2 KB Created: 2021-09-03 11:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ced06908254cf51a80f55a219ada6634 SHA-1: 8897d850a512a0cb99f644d58f5973b6894721b6 SHA-256: 9854ae14b806ed54e0046a566b52aa49b1426e3e18578826ce82fa7efe15ce8e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content, aligning with a spearphishing attachment attack pattern.

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://bbpartner.cz/userfiles/file/karebef.pdf In PDF document text
    • http://getem.pl/files/file/xigonaputumegifibufexagis.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160f60551496b1---39450472445.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/wosogefobawil.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/kojuruwokesixenevupaxodi.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/74770957514.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/788d62fd2cb3929356b86f436c85eb6c/jarifezisokibuwelabinare.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5c959017---xokejejosesijora.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/xalovuzagekixezidu.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/zobabaka.pdfIn PDF document text
    • http://sam-global.ch/files/file/lowalow.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/tuao6p8a6bih0s1n1fg9rngsb5/7414477355.pdfIn PDF document text
    • https://spacio.hk/attachment/file/2957807131.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e7630c1de---defaselosegu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/899adb55bdc846ed3bfac70b62146b87/22568836580.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/33689970536.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/xajejajanaxun.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3e364bd911b8778b7dcba58501918f20/wufivemavawavisi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9604121c2fcb9f28cd6b03e87e518cd1/34736282983.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03dcda8cfb---36560863044.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/ginumologawifibonija.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119853c53750---24161356916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=honda+crosstour+2010+owners+manualPDF 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_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 18388 bytes
SHA-256: 80cf28ba56a4fc76005c446f78e5ed109ab19960b70797cc6a9ce6d618c6d007
font_02_sfnt_off0001514a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514A 10908 bytes
SHA-256: 75eef11170b3d581ffa4549a9a66031cdf5ad395ba0acfe1bf9fa293cf81a50c

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