Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a2b6dcfd9f4d92…

MALICIOUS

PDF

83.2 KB Created: 2021-07-23 17:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8ea33df994c3c2d559de9e551e35173 SHA-1: 842e7452d5c811cba7b39017f98e7058eb21a2f8 SHA-256: 18a2b6dcfd9f4d92e781475ce0567782f317cd1b9526765c6f12fd535d29acb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the nature of the link farm point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://stillwaiting.org/userfiles/file/jalolebemizimamevakagax.pdf In PDF document text
    • http://asupuro.com/user_data/image//file/45901194784.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2bf4af77a---bewerizabogarejonu.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/95619667678.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fuxetebeso.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607581abf2371---balapid.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/57ede8a77e4d6cbb2daa5fb834a1bd5d/jewuromosuw.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c147d113f---32060417061.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/jajupiwinob.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c784c86d3f4---77236052737.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/92900962914.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/64q15ncnebqva6jb7nm3upgi1n/vikox.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/63be5b00e2e23907eb794a548ffe9f3e/bodilejizegupusosolel.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f543324ce5b---48461463007.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160859dfbb8ffb---nipumijelajajoroget.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/fdoutfq4ggib4b288e3oi41ilb/68465323921.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/pumofozober.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/16354548883.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/xuvodevekebuvitadesosil.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/cb30240adf33b64c903325f93ac2b3a9/sumakatuweviwine.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/are4ijnb28tqo4sq4g177ba94r/fukijadalosuxisokibuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ejemplo+de+nomina+de+empleados+en+excelPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/017b9c16ee4c419d0d49c7d1bca51a5d/50885737677.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 10692 bytes
SHA-256: 75b1202f17c862654c61476892ec2509f2f778cf1bd023c9a53df9fe70a884e5
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 17696 bytes
SHA-256: 67e78f14aabf8022deffd191853f78908fe16cb292e9fb69d360041a4e146991
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.