Malicious PDF — malware analysis report

Static analysis result for SHA-256 766df370cf59088c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 12:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6215b3e4281affc41f7083393aab0001 SHA-1: 0828365eca594e96f50cd683c0bbed2580f4d0a5 SHA-256: 766df370cf59088c65ea76e2ee87a871429611486aa63888fbf3ce16596b260d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites, and critically, it explicitly requests recovery secrets or private keys. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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://danangsculpture.com/uploads/image/files/pexevuxesenibabamazow.pdf In PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/m5qqj869kigpqcmnoihbf0rsfj/vijowumulezadonofusoz.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/96726c04761862d006635850a12bc11d/zigoxewovepot.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b52a7397---61889375104.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/zubimozikijodixomarenopo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f4f2b5216---41219181571.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732889b5fde---gijakawitakagomu.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/16026332749.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/7662072975.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/davivuzosujikolonuwubuxur.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07249caea---bowagogewedizifapasedim.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/90599740255.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/91038845634.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/rewosig.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/wowaxiv.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/sunaboneniwuga.pdfIn PDF document text
    • http://henca.com/files/details/file/53358074186.pdfIn PDF document text
    • http://www.asslar.de/downloads/92743936108.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db28f8b7a36---pesilimilekitogomiwogegu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b45a2019f3---xusezimoguxuluwup.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f52659e794fdde87f6f664d70b429f1d/paxetugokakezali.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d26e76af78b---ralubapokekusimezipuda.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/373525926a920d81d29341d77564771b/tajabob.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e71960f7755e27e8b449be766ac11c33/xovuw.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/73891819825.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/xitopiwukazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+foxit+phantompdf+for+windows+10PDF 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_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 10996 bytes
SHA-256: 996edce48d8e797a3ccb2e2e85e72e4a3dc23d04bac01fa0f203c8ec493e04c2
font_02_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 17156 bytes
SHA-256: 3e990ba2a43dddea02944fbea56009d7c3878619cded1dea1ef5de5e06d32c80

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