Malicious PDF — malware analysis report

Static analysis result for SHA-256 772c2f6421e8384e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 19:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df4e1fd691a1582cc816c6e228c13a73 SHA-1: 01194ed97ad65cd15f4921652d1247c89f6c0f20 SHA-256: 772c2f6421e8384e80e2ea3c816c7a5a1bbbaecad84212e7ba77e354bfb83c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting its primary purpose is not content delivery but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://aslimitada.com/userfiles/file/vewamilizobepidawar.pdf In PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/10568989305.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160db14f40f28b---71161739813.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/216708004533bb38aad025c0e35a0dc3/93808960540.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/72684581971.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4898d5fabd996cb6c5d6de54bb8ad31e/80839637067.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1d1fa0c48941df5b4f4aaaeff7a7ac00/litajide.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1dc86c0cdc548df4ea1ffa95010c462a/82433066968.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/gomajunewenitelufat.pdfIn PDF document text
    • http://logicamail.it/draft/media/noresexorofag.pdfIn PDF document text
    • https://promise-land.com/upload/file/damipexeronad.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/64e64395d567c706c31bce96bf624826/fidumaneforugojuwivawiwer.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/80886652925.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/77584006368.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/diropesabenipaji.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ottt5tibht54gnoel83pr6nmj2/96085259283.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/patafudoropixeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248ee31987---sepeforuvupedenoji.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108130456214962.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b822e044806---76628872907.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/fanajizivu.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/fefobovemesan.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/pupurosaloneze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=puissance+radiateur+fonte+pdfPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/7815821632.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_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 19528 bytes
SHA-256: e8e227ebcd01f35de1512fe856d229dce416fbd0f1d26d00306bfe1dde287025
font_02_sfnt_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 10668 bytes
SHA-256: fc5092b0d24e2d81af99200b204cf46ba0cfe62adaa32a7e1d1fa672c0d926ab

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