Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e3657243500eed…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 07:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: feb8a64b0e1d3d6f6a9809b337419894 SHA-1: 547fd79093b41674e3a09e87bc4f390dfbcf2be3 SHA-256: 84e3657243500eed886273530baf26f0e128fa9a1e34d59232e2e557c4138a0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The 'fake nitro codes' UTM parameter suggests a lure to trick users into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://desco.scp.hr/files/25398895326.pdf
    • http://tuecpa.com/file_media/file_image/file/xepapoxa.pdf
    • https://fnb-concepts.com/images/uploads/files/fumekiparak.pdf
    • http://yogaschoolofkerala.com/photos/editor/files/jarikanaponiluvudetajo.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/9db313efa6572faf9af33e834dcdc6db/gatewanideta.pdf
    • http://koryosushi.com/uploads/files/bemodawewaxezonizi.pdf
    • https://altaitur.com/ckfinder/userfiles/files/6222780912.pdf
    • http://thibidi.vinadesign.info/uploads/images/files/10104839124.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143f37c625f3---buxijixupisa.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6cdf11339e98bf04abf13357f0ec2414/62457378116.pdf
    • http://www.ez4parcel.net/upfile/files/2021/09/06/zokodanijabefibalujop.pdf
    • http://strandedtattoo.info/file/kisazifuxorokipufejux.pdf
    • http://titadoorbinhduong.com/upload/files/rudewivatinejitixi.pdf
    • https://12tiga.com/contents/files/79120357249.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e50506d0f---lukizema.pdf
    • http://puisan.ru/uploads/file/47665872377.pdf
    • https://piphoto.tw/uploads/files/202109021825058642.pdf
    • http://lotusburbank.com/uploads/files/kuponitupon.pdf
    • http://gdlejia.com/uploadfile/files/20210916_230119.pdf
    • https://palcev.ru/userfiles/file/kulekizomibad.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mb7gco3e0no9g6qt0k1qq0jria/19868401806.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fake+nitro+codes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99d.bin
f92a14af9106dd8f43bacc0f60be4c8921c9845c9ebec7c07921aad46369504f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 19524 bytes
font_01_sfnt_off00010ccc.bin
453f0c6c5e2b8d057e5c55666adf0c442669ec6345d9ac8d1ecd3dd8287483b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 10388 bytes
font_02_sfnt_off00012471.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12471 16792 bytes

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