Malicious PDF — malware analysis report

Static analysis result for SHA-256 604553c206ab8679…

MALICIOUS

PDF

68.4 KB Created: 2021-09-15 14:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa4e80ee5a0af7fee065518ba8aa01ca SHA-1: 9383eb38fe043fe3ed01d911b41eca034b7f7112 SHA-256: 604553c206ab86796608af46fc9dffad74c3002564afc8c086a7cd4b8712ac73
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to conceal clickable links. The document embeds numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of external links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=gta+5+free PDF link annotation
    • https://www.agencesramos.com/ckfinder/userfiles/files/65926586894.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/notule.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/korivigaruvok.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/suxinitumijunosetado.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/66066675690.pdfIn PDF document text
    • https://dintek.eu/uploads/file/52607727984.pdfIn PDF document text
    • https://bursac.net/userfiles/file/74871106202.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/leratarafe.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1669447394613f405534f2b.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/44957626427.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210905120229.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2e3fecd99e4367332be9f7ab86d6fab1/73663434106.pdfIn PDF document text
    • http://speckrepej.com/upload/file/roxebobularafemakagajibi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413b91d3990---70711528416.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161383f412c03a---20417887712.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/37595687159.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/lusejofobun.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210903072609.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/18566916709.pdfIn PDF document text
    • http://autovoda.ru/upload/files/jaxatobajul.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109150157595668.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/2534470774.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a18f303dd6---mubajuvafujodamusoxuju.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/18559259449.pdfIn PDF document text
    • http://maxbrio.kr/files/files/41027279816.pdfIn PDF document text
    • 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_off0000b2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEA 9848 bytes
SHA-256: 35a3c90aacc80cbbf79383f7f00f6983f61abd15986f35af1590d351e61394f5
font_02_sfnt_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 14220 bytes
SHA-256: a93faa5c481c77f5ae1f1d0b2421cfb8e091b70cd1b8eb8ca9fb18e194440a26

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