Malicious PDF — malware analysis report

Static analysis result for SHA-256 483e3d29fc9e93e2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 09:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a24c68e445d34394fc8994a7c9639215 SHA-1: 21c6b283af8031fdff57fd3d906029354c63e261 SHA-256: 483e3d29fc9e93e2bc61201c6b0217a1c49d3fc01bab2bb108c2fa35700fa230
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q66kvhmdvp6lhe3l0nlj8mksq9/daredojufakudapezeb.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/tujoxegobufufituvate.pdfIn PDF document text
    • https://csn-alliance.com/data/files/3944605242.pdfIn PDF document text
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/48898649680.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/683e6ee91ece816a15368cd828f8b1f3/46872180945.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/76286276759.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/44351484505.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210621034607.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/lulinemokumojobuwazexupi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed943a0d1---jugovoxudagobuloxa.pdfIn PDF document text
    • http://fxlcd.com/upload/file/wezogosirotuba.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/19454692952.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/jumudutotiwekakob.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/kulupag.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/89429344211.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a121a177d6e---sidudedixes.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/lajufoxotepugolo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bd2f2539b6c1d49b13e3c362bc42a498/4547903541.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd94bbd4021b03aab7691dad57097c01/75489522477.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/sqm1uldjuf1c1qj7qkr5k00hs1/polas.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/44583940232.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20348d007c---63559989643.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe93c2779c---xezezinaradezoneregarin.pdfIn PDF document text
    • http://henca.com/files/details/file/85012162332.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/71999661337.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65dd4111f0---fonefur.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/0ou5jb3cdvp9dd2rqghr3tr1u6/reninoxudexusoteridakij.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/86117678347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=stoichiometry+questions+and+answers+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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 11360 bytes
SHA-256: 2c5e864b6ff0b5def0d574ed83c39a2cc7288e098ca7374d03d1f0ce1cdb40e4
font_02_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 18392 bytes
SHA-256: 11304547965a1c85d82b40b371e289327401881113f089f619ec9ab73cd496d2

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