Malicious PDF — malware analysis report

Static analysis result for SHA-256 738ba66551ab7b68…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 20:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e9c621553bbc240223836b2d1f14ad2 SHA-1: c10e9ce42dfc6f336150f06464ec33bf34b5a552 SHA-256: 738ba66551ab7b683604ceae635dcc6c349e94169f0a7965a8b757d8e38b1005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to WordPress sites that appear to be hosting PDF files, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4eeb12f7d---kevexuwidaliwinuk.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8fd0c216eee87fe4eacaafb109b43ac2/39134174684.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb5b8535d0---kidajunulumavubelukuma.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/23cnpr4h2d24c9gmmp4hhpaqn6/dusexipapidogakebalefe.pdf
    • http://lyshiying.com/d/files/59070272913.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gnp1a9utq04teil35svcl8pl36/36049272629.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/593b98ad2f9070787a5c39e4b9f9152e/35299275581.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/506e8c5a405bad06d6cd34fef235e824/7765511367.pdf
    • http://nfc.soo.jp/file/9912921927.pdf
    • https://auto-rujo.com/images-editor/file/belejelog.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712a7902705---kusefikijefo.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g6m5bv2n4k50300i103b8nbuu2/33025426297.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072942b4cdbe---dezexixajezujo.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tc4nkc43a2fcsa8fr087fms5qn/duganunupunolezuzikas.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607941314882f---35983399502.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e89415edf---41840716920.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b14bdc3f2---koxewuvezonomipim.pdf
    • https://hkbca.org/UploadFiles/file/20210623111151197.pdf
    • http://ubest.ru/images/file/bukufeperigedi.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1ead72043---wobeseneba.pdf
    • https://sanidom.pl/img/file/gamefenunofuxotozu.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/5611071673.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a59a45dd13---xozebazeromo.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5cdd3934e9eba97af32bb84ec0c5b13/dawab.pdf
    • http://mg001.cn/upload_fck/file/2021-5-8/20210508184909353919.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877f9b51fd6---46973633756.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=velocity+of+standing+wave
    • 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_off0000f0a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 16792 bytes
font_01_sfnt_off000108b9.bin
c0e8381e5165d42d89c1b21f9cf8b5b823861d75a8d54ed0e6af01cc4f008006
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 10788 bytes
font_02_sfnt_off00012193.bin
fa6842af4c5ebfe016ea11f91c325c080f0430a055a4cd1c979f6754492dfeae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 17348 bytes