Malicious PDF — malware analysis report

Static analysis result for SHA-256 7831c126c35b2566…

MALICIOUS

PDF

89.6 KB Created: 2021-09-18 03:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e7d8e70194b3dfe355a996f4104f05e SHA-1: c5c19fa26ae120400bf514f05bdaf2624a5b27d7 SHA-256: 7831c126c35b2566c41667cf7d6c0ba18c4d294b8a4ef4b6473148e6ed424cb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://allytemp.ru/uplcv?utm_term=the+last+of+us+android PDF link annotation
    • https://xnkvinatimex.com/uploads/files/94172806745.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/45756845093.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/9qre3g93cceso7oca8kihkvfd6/jamakiparebotenotajopizo.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/36244178376.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/gamawit.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/hdde4g9vru8l2fssqflkaja99n/pomatanemudevujuwuxodo.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/ponekip.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d0ae8477---8829100837.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/91858515422.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/69666163502.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/83728497270.pdfIn PDF document text
    • https://mfdesign.hu/files/file/66701951171.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/77354309504.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/kilawofufijidavixuwujas.pdfIn PDF document text
    • http://888chji.com/userfiles/files/pabojase.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/42060642821.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/72578ad8b5f5fbec5e3190c47d235c34/68851746409.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/luburofosov.pdfIn PDF document text
    • http://saktigroup.in/uploads/vosovujojusunivovolisab.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/2007270468.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/84655696689.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/62618659443.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/tibuminawuvitakenuzive.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/jezenumobawadogut.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 16356 bytes
SHA-256: e96b8d65d0f583571d906bcbe7fb95f7ee4d4582435199a118ac4984cba72000
font_02_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 21492 bytes
SHA-256: 376c1d36bb78d1909f775aad1bf31dc83f9d9b3f4e16da1983c39474da52e167
font_04_sfnt_off00014015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14015 10516 bytes
SHA-256: c2c1c95d2710f8b0eb7b468006e604ffe3e8cd43ea43ad8e612cc516b8b03861

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