Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d97165d933eeee6…

MALICIOUS

PDF

75.5 KB Created: 2021-07-28 09:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 151eebaab9feb5c0b04bb53bd8fca51e SHA-1: 07ae6abb422cc2a1a28f94c971f39b8e624d273a SHA-256: 3d97165d933eeee6cb1a8cf6d1045efa91ac5625a734114a3106a901c7efdbc6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. These links are likely intended to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c6aea484---26305364741.pdf In PDF document text
    • http://interreg-ipa-husrb.com/downloads/19368042992.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9bfec2a0---gawupepuxokokojawag.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/484ea4d6a5c8549504a3d3db17437e69/tubasipinobolufejipakatun.pdfIn PDF document text
    • http://olympusflights.com/files/files/82730942849.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/95609901234.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ad5d3727---9045483102.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3395b5a508255e5322bb9ded4c9d27e8/rotupexofimofuferivitemiv.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d827a7c2d45---vawutasanidenar.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f70203f90debc0fed3126be431613323/juzidisozisibelasirijodok.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/kiwazesubeti.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/2402741987.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/buzunexebetolijinologisi.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/njmh6269jub7bs619bo4gv90gv/81735593606.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/25431941303.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/katerabi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/57771491d3bf3675615a4e00b5c281c9/56193454866.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/zurutitinapenubov.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/22463542126.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/netidelisusofazetuxiwu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe561f252---16413509391.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021626105880622.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/64518509457.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/susimofurasepuko.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/68275125575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=i+love+you+baby+frank+sinatra+year+lyricsPDF 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_off0000c6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CE 15920 bytes
SHA-256: ebd8e09b38a8617900f309f316c6324a781dfd20aa0e4e18168cd4ba044568b0
font_01_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 10792 bytes
SHA-256: 1f97e0fc9838b7bfd7b16132c71b35cb8dbd834e500e55f692c56136e400cf25
font_02_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1