Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc05f401f90df75…

MALICIOUS

PDF

82.9 KB Created: 2021-08-31 00:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c39f5288c2e54eacf83548a1d55e45f3 SHA-1: 9b485a1ff44079f1543c24adb46c305ebd48d025 SHA-256: 4cc05f401f90df75eb8a195ef466aba2fe88af122f870d3a373bfd9917c704ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download other PDF files from compromised WordPress upload directories and disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e7150993---31437961078.pdf In PDF document text
    • https://bbpartner.cz/userfiles/file/85926896948.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/65013549728.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/9157484279.pdfIn PDF document text
    • https://aedwea.com/upload/foto/wudatuzuw.pdfIn PDF document text
    • http://fygl.net/uploads/file/201750194537.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/wijojaxukedugijigurawet.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/6164751716.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115f9ff10160---pugitoxomuzamedepogimobax.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6c1c031a---lijudavojekok.pdfIn PDF document text
    • http://df-foundry.net/d/files/26173423284.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/goruzikenotazano.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/firilulepunodesalorot.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210828221336_967487431.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/jevoruwul.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/21056791745.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/xoxilala.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/10996494432.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/jodukupamamufoveki.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/liwubakomiveso.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae78502917b---nubufanomosew.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1db3ab340b---15463422798.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/38652181401.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///26087773070.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62605ab60---74404642845.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/725116ccb34da5a273af8efd50a779bd/wipupeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=carry+forward+examplePDF 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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 17944 bytes
SHA-256: 5ddd1c2767f3f40fc606e112c787f4aeb3d06bb984d23e789eeaa328595ecd5b
font_01_sfnt_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 10528 bytes
SHA-256: 6ce3ecdecefaa2b7f5fba4714161c95c44e6b34341945dc3ddbe2241e3fe635d
font_02_sfnt_off00012512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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