Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1077139b91c68c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 12:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25d20fe399f7ebaef90346952f1c29fd SHA-1: d75a916b0fb4e05ae3b9dff0f0a2d6c80fb6c42d SHA-256: 1f1077139b91c68cecfc48d7b1628005e888d18085134d61453f1cfdb8237860
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous URLs, many of which point to compromised CMS uploads or are part of link farms, suggesting a phishing or SEO manipulation attempt. The presence of multiple external URIs and link farm heuristics indicates an effort to direct users to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/17cc2adcd22bb36ac0b9170948d58648/nuguburulemunaro.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161102b1aa7bbb---xepemulozapipofiritugele.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/sajoribebi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/00720a1bf61f87c4e020ec0f5ee728cc/gelupadevivewos.pdfIn PDF document text
    • http://etre-belle.su/images/file/kakuximufivatutusaseb.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09822dbdda---diromavatapanoduliza.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/44190571671.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/96498899236.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/063c0cf30b8348c2af882f74ba23adc9/22265700295.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e7da66ab4---dajolikevepapidogog.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/134f2d974e87edd83ac0890b29b90ce3/96930271961.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/3056bc69f19372a608c576439f4937b6/73304390838.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/9032366494.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/xibigeginoruwusovowerom.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/be3c268c6fb2972412f8fed87ccaba00/15491490198.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/5206727954.pdfIn PDF document text
    • http://juentai.com/userfiles/files/pipurenevebitaguruvepuxu.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/gijudunageropopasu.pdfIn PDF document text
    • http://camonetinternational.com/files/file/gigarofarit.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/wokitosubusidinawowebanus.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/67bibp4nudrloq1csmq55ph4tv/gerawasamawojesoveboni.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/40129226436.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/cdnif4h29lpuu4ojvv4fuv4c9k/kugozozibemedakavip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=improving+memory+psychology+pdfPDF 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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 18308 bytes
SHA-256: 62a485e57bb2e4e7448cb26a5ba8bcb0f6a82912b4923aa8d3790992808614b1
font_02_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 10936 bytes
SHA-256: 1585e5000e023149273ba6b51e03da0ab0c4899b5938ef30c3b85a0107c0d2c8

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