Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91cb9f91401a8fe…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 11:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 024e746c0c6325edab5a4f02ac1c8e84 SHA-1: 0b49f1f06eea600be28b260b09fcea468f316a52 SHA-256: d91cb9f91401a8feb6d2c4f5acbeb1770d38ce1abc1c1902fbbcf1eb7c32652a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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 http://evrokomplekt.ru/userfiles/file/joziduwubirafedadup.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613180b3ec31a---92936495708.pdfIn PDF document text
    • http://df-2.de/images/daten/file/75165661823.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa4f760c1---jaxig.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kosovujawafaxarubido.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c647c98683---12126078033.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/kuxabapilegavebetuxi.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/9717044748.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/vifigafile.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/53106974317.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/kemob.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/34297807897.pdfIn PDF document text
    • http://silver1979.com/upload/file/29978814711.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/28076968135.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/jagujavigenaf.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/ramega.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wusegawezeb.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/suxesuguxukamol.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/96955659307.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/35505244248.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/73787983802.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/zojetadakomata.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/15634933666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wallpaper+4d+livePDF 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_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 10032 bytes
SHA-256: 1f73fd795d9e8afce85b1595f537e00281e2b5b4cea3bee3bb4b10dfb2503b6c
font_02_sfnt_off000115f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F9 18908 bytes
SHA-256: dcdf9c84d6b98bd591669cf749d39a1decf62fd3b8cce2d05c1dd16f78e456b8

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