Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2b6a254a535b94…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 12:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be2c13db1e8d523911e50e7758a3b58b SHA-1: cddd3a9d0694bb1c6b9bfa88b5749c367078051c SHA-256: 2a2b6a254a535b946b7128ca6974d15d262affe8bd11ca8bfaadd3ada50577e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/432523450a2e6376958fd214346fa433/jorekud.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608344da8b9f3---pesokoxawun.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8493f7b61c---89396772618.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c7d58db0---fizaniko.pdf
    • https://a2designbg.com/userfiles/file/91344981085.pdf
    • http://a-swiss.com/upload/userfiles/file/60827081115.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608349c6266cc---tujoforematili.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/825b2ae1b4403e821eb0024501bbb64f/texaf.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609285f1f3ce4---30649519316.pdf
    • https://xenang-mitsubishi.com/fckupload/file/wewemal.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077058dcbbb8---pigagulusowisopefit.pdf
    • http://musclecar-taps.com/js/upload/files/vagaxozarexufanama.pdf
    • http://tfforming.ru/d/files/bafov.pdf
    • http://scheiden-maassluis.nl/uploads//file/zigagitivanitamijosibi.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce403d0f3---87331831917.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d0e62b6b---29655927102.pdf
    • http://massarentearchitettura.com/userfiles/files/govaxobixebenebevexejuf.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc252c58c9---kezofipetil.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/gimenereketelona.pdf
    • http://shannonlakeestates.org/fck_images/file/16846806411.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o2hrochek45k72n8sai32cn4o6/32683658849.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/18d783263d8e129c2cf15e197f7d34d2/36995790834.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7ff46a4b7674760193ef1e1deabcddc9/lunufevorodobikolux.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160718d018d0a8---fekewugovefolefogepejeni.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17c921e48---vapawovijabu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=air+force+civil+engineer+afsc
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/56f804bc36aa50eb4bca64380f1c2914/65696720112.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_off0000f704.bin
4cd23e9b669269631daee9a6d14bedc226fe28c169b817dca2e1c9adbb059230
pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 16124 bytes
font_01_sfnt_off000120af.bin
32bab08f4471a8ff304465539ee3f10803bcc100ce05a582bead4c41a7303e45
pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 10460 bytes
font_02_sfnt_off0001388c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1388C 16792 bytes