Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d18aa9fe16c724…

MALICIOUS

PDF

100.8 KB Created: 2021-09-18 07:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cfe784f031bbeb8ef61a5953200da94 SHA-1: a01130aaeda9e8f09e6db7adf79751a6718eba8d SHA-256: c7d18aa9fe16c724aa71dd3e4a9830708380d5feb8554737d750a9e1137e7265
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised or hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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 http://bukharaalpharetta.com/sites/default/files/file/12642178680.pdf
    • http://koreabulk.net/userData/board/file/99065634208.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/51568611156.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/96499961719.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jvsvj47l1vdd2ui5hdlgaqm4s0/bodofexovapukukenifopa.pdf
    • http://metall-press.ru/files/tigilovewabolimibexofugav.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/9072025502.pdf
    • https://varida-tech.com/ckfinder/userfiles/files/voxedumisisivotef.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d56276f44---gonoliv.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161312364a3d16---78642890605.pdf
    • http://ancheng-medical.com/uploadfile/files/mamibagojiludusip.pdf
    • http://hhoasis.org/app/webroot/img/fck/file/winewov.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/pejajalorividet.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/80f065ef643a7af076f96a12dc6de184/46533422009.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca0e25150---dudoxonamotowurokufusuwe.pdf
    • http://constantcontinuity.com/membership/data/files/14132642059.pdf
    • http://dsfly.com/uploads/files/68405564468.pdf
    • http://tcsm62.org/uploads/news/file/xuvegiwalevizavosorabota.pdf
    • https://pgprojekt.pl/Upload/file/ketulupesirusowiliz.pdf
    • http://trans-serwis.com/userfiles/file/93765595681.pdf
    • http://arhive.np-sp.ru/img/file/tipugasewagomagivupiwosu.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9789af22---pobikusibemasutug.pdf
    • http://ogledalata.bg/uploads/pages/files/27840543621.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/8057587312.pdf
    • http://bassbasement.org/userfiles/file/varadufixivi.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/nebopujifupusuzujal.pdf
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/vuxuwajevupirotusizuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=warhammer+fantasy+7th+edition+rulebook+pdf
    • 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_off00012075.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 16792 bytes
font_01_sfnt_off00013887.bin
8e841a5f2a04b72f4705a55eac75889dbc72d4dc67837939b3ccbd401920e2d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13887 18580 bytes
font_02_sfnt_off000168e0.bin
a9de1190296b4406bd188f9d5dbc5e5a8162cfd823869fc410e49fa6a9e94391
pdf-font-stream PDF embedded font (sfnt) at offset 0x168E0 11252 bytes