Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9bb1bb445a9d3c…

MALICIOUS

PDF

88.1 KB Created: 2021-07-26 21:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef537645652af27c1bc8d77d4ea0aee9 SHA-1: e6e05b5969a14cd122aa984ff97a4bd6d231efba SHA-256: bb9bb1bb445a9d3c85f87b2f7da400c488a251c1dada146df24e84553d548a07
204 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including a link farm pointing to compromised WordPress uploads and a lure for a password-protected archive. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The document body is heavily obfuscated, but the presence of a download button lure and password instructions suggests the user is being tricked into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aadharshilaschool.org/userfiles/file/notadepividodokol.pdf In PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/74055859665.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd33705840---rujadejigipofenipovel.pdfIn PDF document text
    • http://ipublicity.cz/data/file/vamuvosimetijesup.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/jasewodigubitujuso.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/k8itmj7hbvj79rl0t74e9t8de4/34902877328.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/modaborigefapidixixes.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/talitubitebak.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5111d3cbb5---87827750631.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaa13b0227---tipepatif.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/d0fa5542dd5b5591ae1dfea2bab0abd1/40486925165.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lopaj.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/6441126506.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/serepukezaguwowem.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f89c048f---jerexiwazowagasajusizof.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/10580124297.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a47806e20d---bopuvemidobomunefo.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/55535473719.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/bezezazipaxidafusewawota.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4827986e---duwig.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/80203004600.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/mbp02h0uc7f9olchvl8d2gcn4o/75700126270.pdfIn PDF document text
    • http://laduses.nl/image/file/wixalefimomobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=guide+for+among+us+for+imposter+mod+apk+pcPDF 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_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16872 bytes
SHA-256: e106badb4fba539850e1957ee5d918483818d3373d7b5054c2d04ffb026f3669
font_01_sfnt_off000120a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B8 11148 bytes
SHA-256: 3129ec027f01e5dbe51cba4a4d0063c7485a105cb36cb9bc5faacb98c92654ac

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