Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aecd06f5676f787…

MALICIOUS

PDF

74.6 KB Created: 2021-07-15 22:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3976728dd3e3500f1676bb9a3a7b68e0 SHA-1: e2eaed29838fdea17a6e41572fa16f9981775639 SHA-256: 1aecd06f5676f7878b70c12ce858606fc0f7d3c2e0ae5b47b2d031d3b7ce7630
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites, likely to host phishing pages or further malware. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://detaycopymatbaa.com/userfiles/file/34503353879.pdf In PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3q3gldg5b3hgaclhejfdoqo5pf/wovekaxedabijulodanewip.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/tewugibuwoka.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71a980d35---navepidigulazemelosadoxuz.pdfIn PDF document text
    • http://devison-matras.com/upload/file/77760964465.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8nrutm7rk3i0lmiua3ds0s3440/tegipudiwotu.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/sipebarenawokepojinaluno.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/pixoxafukadikosalape.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/843a4c1905279ba4bc42e0474e6f8dbb/padekosaxoruzapidoz.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772bdee3e80---zakumudirekuniba.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/94994209538.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5503e2745b---piwije.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be3df1eb44ac36707f9a87bae57baa8f/zugewapodotokeg.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/kutaxemuterir.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/manamilotitularamenurom.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba1d4144e1---1764422494.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/76268457707.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b954f4679e6---62779108510.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d13777244---xebexinefarufutove.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b3a139e24af5ce2dea50dbb372688c33/dipiruverovibidilegof.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6bdee9f48---sineto.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/9839781054.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/68912192723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=123movies+beautiful+creaturesPDF 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_off0000bfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBC 10944 bytes
SHA-256: a9b91bc7f3315c68ba63396d56f592b7702a352739b8633bafc3824025355a34
font_01_sfnt_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 16736 bytes
SHA-256: e1b000ef62d4dcad6acd74d36f4d11084de71157cc8a5bf73982d2b2543ff79a
font_02_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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