Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f3dd396266d5b7…

MALICIOUS

PDF

89.6 KB Created: 2021-07-24 04:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04d56a304627f617ed727176dd489a4e SHA-1: 22b3b44adea5c1729a7b5323cec8080f99002b19 SHA-256: 82f3dd396266d5b7ebabe8cb95f882d1b80f05cfeb67bd35188e8fa811aea351
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, likely intended to trick users into downloading further malicious content. The presence of multiple URLs on potentially disposable hosting further supports this phishing and malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b48f7fabe2aec6a94025fe5b8de74cfc/zimanus.pdf In PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/83216949857.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/lovakijoxilokabu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a6ad0f74---nifuzavujazezomawikaxix.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/21425547885.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/97269195.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/57390521913.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/finopopikaxetesunorowo.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/wakoga.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/09ufrorkmbb6n1bf8praphdkje/57462406791.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/rixepujiz.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/xipususorifila.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc76aeefb3---kawiboripi.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/subetujegidejavala.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4d2d194d3486853c1bdbf83266d93629/laxuzinonofebafezodida.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/9309313183.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/8811180276.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/12699019262.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/selivodofid.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/winumufebitu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4kd6ku111rq6l04uiv0onuu27o/busipudufu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/etrbpbqgoqnbbi3qnaaguu9486/74017553254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ccras+ldc+previous+question+papers+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 17212 bytes
SHA-256: 52fb2f26034c9f41d7006b90bc68d0daf787a5be6bd5503813684f2a5fb02123
font_02_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00013f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F14 10956 bytes
SHA-256: 78ce1c8ae5e5502ed21722da6ef48cd64ae3d842ff2b1ee23746e7f05f646135

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