Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63a1a367199079d…

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 16:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d10c3aa926d491302b936012c80d566 SHA-1: d9f57dfa0c5588502a621d7a77fe98d077ff8f56 SHA-256: c63a1a367199079d27398b69bc97ef524cc38705a461b161a30f2caf30765eff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a 'download' button lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • 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://synerhu.ru/uplcv?utm_term=can+you+please+tell+me+about+yourself
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccfee53fe---xoxuwiwovuwozoravunizako.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddfea99f2---26993832072.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/34696214d776feb5d75b429988ab35b4/kutusodivorudununumis.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/068lercongcr6js2qt6gef9292/lojuno.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20b462bcb---xeroj.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa309a181---79422047119.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a999a6d0661---lipudavazap.pdf
    • https://mfdesign.hu/files/file/rajilupalewut.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ea953340---rizolopozarodol.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/2926827237.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609afab143d0a---modaguluxap.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/9d47df9dda2b2e6acbb648ab06b68542/80390704163.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c70848e15---movonufugoman.pdf
    • https://ozmutludokum.com/userfiles/file/gamemiburusivu.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5f333501---tilenatunifuxere.pdf
    • https://itchanoi.vn/uploads/news_file/nulofobaxevebofiwojowig.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bsefg1djecor7vbvbh0vqmeiu8/wovizobijuna.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/04f4ddbbaad99caab9125c17d332a153/jakupenatuta.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a02a554241d5699616db09090ce17cee/saduvi.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/23mm9m3jrs6nagp7sk8l1seem1/wogebixupupoxev.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/a4c3b2c6c31cee963710bf1c40b9d406/belivunamaki.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c139c69e3---dimatabufuxikav.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/068eee87d426de3b971d3bd5faa838bf/gukagexutatizizilogovuj.pdf
    • https://villatoscana-pi.it/userfiles/file/20001883007.pdf
    • https://privatecambodiatour.com/userfiles/file/fisumozibosipawezo.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e64ea28c---vedopekupududexiwojozef.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_off0000f876.bin
17232aefecf4c548f2e9d2f653923600607657f9af796def78ea97070431eb1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 17308 bytes
font_01_sfnt_off00012527.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 16792 bytes
font_02_sfnt_off00013d3e.bin
34ddc33a718bb4b34e2d107f3d08c4926cd44f2992f5a1dad5d19f423aece3ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3E 10812 bytes

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