Malicious PDF — malware analysis report

Static analysis result for SHA-256 445d59c1694eda33…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 20:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3fe3476414bf7bb6924299cac3d5653 SHA-1: 9a1e9ee6c4c9e3d72de63dc02a98d1e7aea99ff2 SHA-256: 445d59c1694eda33ddf47c743a74bf7f5aab3c1c84026768ebf2fb127ba2d3cc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier strongly indicated maliciousness. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10561bf2d---befomuwusuro.pdf In PDF document text
    • http://shuswapladystriders.ca/userfiles/file/wafigewamaruwarirusajufem.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rs13hvlf30guofd46ks4hpngf1/17378393573.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/63i7n7fg64fq9kp7f437gnk86j/36786381968.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/542f8thfeeqicc72f10i1m5phi/54598023950.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/51304049649.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1627aab3---37457230359.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/boserq04m7rcg7b1cndrpo8qt4/wapowen.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/felexiviferojusarojefele.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/14918455883.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dee9dbaef9ef945cba8a0ed66479e47a/51484154001.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061518440170554.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31a74ec2f8---ranagizaliregasusematim.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608048fd8dc15---mujugopejijujajikevarokev.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/igidonesedajek.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/66106197760.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ab83bf327---japezusefa.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f2aad6b2d578f603ce8914ceca06283b/kavoxitiwaroturo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03dcda8cfb---36560863044.pdfIn PDF document text
    • http://sakem.org/userfiles/files/wamafenen.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/worowifefilofuwo.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/93688737598.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c112a0082cf---risosugasane.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/dadevusajevug.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/deduragidunumavosuzojov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=old+rugged+cross+chords+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_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 17436 bytes
SHA-256: 4ff98428b911265a32ac0a3355f7afd029ffa4aa281deeac73ddabd4d3bd0e2c
font_01_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 10568 bytes
SHA-256: 109fc714fc64fab98d473f0597637ff619a290bfb9437e47e7f4bea9c8f5914f
font_02_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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