Malicious PDF — malware analysis report

Static analysis result for SHA-256 827bada2a60fe9aa…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 05:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f8b4ee359db4aa3a58f16deea852c94 SHA-1: c52a4f9ebfbf4d348397c6b735bec219aac37a5d SHA-256: 827bada2a60fe9aaef4677d49c4cb12b2b2b7f1be441db83e73898e34ef09f55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs suggest a link farm designed to redirect users to potentially malicious websites, indicating a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=definicion+de+harinas+pdf PDF link annotation
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/aca62e2a960313e8954fb90d641ec102/rebaxepalefilujozurop.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e200fcde76b80f85ae66aaa21275af3a/92679084765.pdfIn PDF document text
    • https://areicon.com/images/file/xisawitudajugisonam.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d38000135---11650482699.pdfIn PDF document text
    • http://hotechike.com/files/files/91508247261.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/80924713991.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a2eb7c068---94390639239.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/20854081331.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/lajagufafufirosix.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e83ac1cfb50cf6b65218f34f15ff4f58/80242102470.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a8af1bb417a95293496cc621fecdb3c0/57964953.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/96153886597.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/31596690957.pdfIn PDF document text
    • https://quizai.com/uploads/files/63060730928.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/32095300794.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091923b7d49d.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/6816599387.pdfIn PDF document text
    • http://www.77ice.com/upload/files/limonizabup.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/r894gdfkj71l0hr090uu1p5pmm/kokafilapapogujanopo.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/lagixelawujufu.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/39140973803.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4285af00---xivinelilufili.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cef01c3d0---jolidepazalor.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/20982381615.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/2da74014089ad542882d4ececeac9398/15941711793.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_off0000c337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC337 16972 bytes
SHA-256: 894399617123ee3db0855a305af57ed4e389fe6151edcd2841ad38169cc5ab24
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 10572 bytes
SHA-256: 57a68bae2f9ddd840ee7774219426e728e189956d80bfc3d4885ba48920d1b8a
font_02_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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