Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaaab56c77d53201…

MALICIOUS

PDF

124.0 KB Created: 2021-07-01 14:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25ef6abcb395de389966d78e9809e425 SHA-1: dc7b9b35c5a2fa4bb3b804f0e13c1f1d0a1b092d SHA-256: eaaab56c77d532012e5b3b4136e66f0e5d722e63b53717e1a8ccca8dbc5cd082
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=rill+and+charmy PDF link annotation
    • https://abofahed.com/userfiles/file/sefugewodesug.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/68d4195c24f948386c954a020de1842f/zelifenu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc62e4fe26---74421084362.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pa4h8pj395043j7a0f68fojoi6/nowixabagumedixikil.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/majasilonij.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/samugulir.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b620e609e0---51888829736.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/32f95eedc4aead3ea03499b305a0a475/35289880531.pdfIn PDF document text
    • http://axwelindia.com/uploads/48642872238.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1eaa16756---7880553166.pdfIn PDF document text
    • http://abnicum.com/files/file/64673460239.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/48206654743.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b700e3f846---8452280283.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5s9ofqhfltionto05olafhe7qa/madinujegit.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/17b015ed604202a2d36e5b0d5743b780/gukibadinasobekiginodemek.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/56773546142.pdfIn PDF document text
    • http://email-database.info/userfiles/file/wiwubadodutibifilikelib.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/17408532421.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/76779179959.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ebc141c0---ribizozamebivume.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16611 18084 bytes
SHA-256: 0d628386d9e1ae12213e130f3b33ea35dddcad82178ee8e95dbfe63de1b2b91d
font_02_sfnt_off000194c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194C2 10276 bytes
SHA-256: 9c5feaa6ece10f018375d6f3ff67a1d39847394b1612bec0f52f0d9d55f66561
font_03_sfnt_off0001ab86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB86 18016 bytes
SHA-256: 338f05fb0dc378991e684f0da46beaec9978e8df5345201b660c3de4e68fa505

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