Malicious PDF — malware analysis report

Static analysis result for SHA-256 5636d30c30626eb3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 22:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16b36a81187d57c07e545fa71a23a2f7 SHA-1: 2e449d4881caea47242dadc24cb06fb0f7ebe0df SHA-256: 5636d30c30626eb325fde5bbc44ef2547bf5d8672e38c50f01e2f10cd2a20e1d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various websites, some hosted on compromised CMS uploads or disposable domains. The presence of numerous links and the nature of the hosting suggest an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://fortwashington.abwingsmd.com/uploads/files/74153481577.pdf In PDF document text
    • http://e-sportis.com/images/upload/84860622032.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/sowezakibebasajofapopu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m8jpvop74f785i1ohk4jr9v8j3/togumepugekitokijoletikad.pdfIn PDF document text
    • http://midospa.com/upload/files/bomuru.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/ruzijimesapowojalirugo.pdfIn PDF document text
    • https://33mobility.net/uploads/files/17466586654.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/72444857710.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/5039760530.pdfIn PDF document text
    • http://clingac.com/d/files/soniza.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/o3664cd9huikvon5nkv8iig8e0/ruwazegaxeduwegoze.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144df9f967cf---pozorilokevuxamoroga.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/21728934969.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/pilizefeva.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/xorazazozegekipugik.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/duxasupisudadoroli.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161322fe7043d2---43057725589.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/973efab7bceb842e47cad87e898cc1cb/58104047458.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/rekin.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/87145108674.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/o9eb1a2gkbfbntk6f75v9as2de/78395715528.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109230203272938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+pocket+tanks+deluxe+for+androidPDF 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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 10996 bytes
SHA-256: 2af050d80a1588fa20f3dda9b95b364a210fc96deff5012e84a44dcc014a2785
font_01_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 18428 bytes
SHA-256: 8697696dc17cc4ab997ee5518621c75b45bc73d7b78c2635144e35ef85ca6a8b