Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56c9c525369a212…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 06:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ef1f9d5da8b246eba8f8192f883cc2d SHA-1: 3b56391445c3e66975a9fcc56af23af05104341f SHA-256: f56c9c525369a21247b817ce0daf011ed3dfb9890685b647f4a950b46ec89e3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on potentially compromised or disposable hosting, with some links pointing to PDF files. The presence of external URIs and the 'Urgency / deadline lure' heuristic suggest a phishing or social engineering attempt to trick users into clicking these links. No scripts were extracted, but the PDF structure itself is used to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://santamariamikado.com/uploads/files/jarizuxonevexalu.pdf In PDF document text
    • http://harasim.cz/uploaded/files/33439118045.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5fd527f65---71607022258.pdfIn PDF document text
    • https://cartolmania.it/file/rezogevozizepori.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/vajopo.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/69502526004.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089786edc6d0---mepewiwino.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/jagibotuserafanijurafivum.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/rinerugolebozukejozob.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/tinabufozerofibo.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/41378317157.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91d187518f---62369387942.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kodujuxiwijexa.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/webuwefirum.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/55200855810.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/60166258173.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6617089a9---mifisozidil.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/guzimovusebuwidarakapoleg.pdfIn PDF document text
    • https://shopabrang.com/images/files/pijagegevuxofave.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/73202731225.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/juxijokosukabaniwiwopijol.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/9785048204.pdfIn PDF document text
    • https://olterus.com/contents//files/77623616912.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/82207141767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=to+wake+up+and+smell+the+coffeePDF 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_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 10932 bytes
SHA-256: 47b166aeff7d613da1e7269f7933cccbdd4da3ece8fff759631d8ce20523382d
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 19084 bytes
SHA-256: 933b290cdd153bffe7549b3b8aeaf090d6c2e89de7f6f845d40dd695cca2ccce

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