Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a87b21ce60ef42c…

MALICIOUS

PDF

89.7 KB Created: 2021-07-15 21:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ec1f355c38874d826485a53744c288fa SHA-1: bf495a39f348c0fe5639c72f32e4285298051439 SHA-256: 2a87b21ce60ef42c7a48958fa09e6b6e3d525f59b9e1bf83d52a0415ef4aa0cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://crewmak.ru/uplcv?utm_term=pharmacological+treatment+of+myocardial+infarction PDF link annotation
    • https://dondepodemosir.com/userfiles/file/59805398224.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/845921850.pdfIn PDF document text
    • https://autopratichesas.it/file/48065492873.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb9268122---bekovol.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160867aebac140---nevifovobafurotibize.pdfIn PDF document text
    • https://istanajp.com/contents//files/banewatedix.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/66653900751.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/vilidokom.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/rasipumebujexote.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4de66d46f---14291254123.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f345092bf87e00fce5adb3d571aeff4f/mivikumivatovatemutimup.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2c64f6540818df571e00ba9b2d2ac5d4/6582854297.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc42ad9baa---36820442012.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/37ecbddffb19193cf6c9fe892c084707/31371439507.pdfIn PDF document text
    • http://coffee33.ru/archive/file/mulotefawinajevubok.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8646d6082---fixutiwimawanuxetekagup.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/1486878511.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/timudinovovilit.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160af4b11bb213---17594897277.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759304875d4---68572483531.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/huf0jsg21crrg3f9vhjs70td2s/17113259218.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/gepigi.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b6ba1968---zoxisilemowuvonukigejag.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021061308260262.pdfIn PDF document text
    • 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_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 17476 bytes
SHA-256: 2e61d2a31213a45280b1fa2f4ad100968d7bd86dbdad80bb87ab5fcd31700273
font_01_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14062 10872 bytes
SHA-256: c400659f4af4bf0dbf81ced300077ce552bdf994eabd1ff7824e1bcc67438f60

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