Malicious PDF — malware analysis report

Static analysis result for SHA-256 389d358399cf7c07…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 08:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36fac9c34719f681fd3bd7ee7d936993 SHA-1: 1767f8edee38f3a70811348cdb691235919f349d SHA-256: 389d358399cf7c07f2efc5e5f64d42a774bbb0aa81a7008c85ad645c047a8d13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://allytemp.ru/uplcv?utm_term=how+to+install+android+apps+on+blackberry+q10 PDF link annotation
    • http://snabsz.ru/ckfinder/userfiles/files/81924331665.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/jorexurepefotezor.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/kakokusujukokafejipokepeg.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xejegiwezijirudata.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3db783cd345d65875d10faa557521e45/pedojixebowovowugol.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/29261198236.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdc1d7104---35820521167.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/lojowawule.pdfIn PDF document text
    • http://hodori247.com/uploads/files/dafefavurenoxisif.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/37036340281.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/6qakrmjfdb123gs3suluklkg6g/tupunematinejone.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/zejiwowedivugurepagafolas.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/febagekuvetovotot.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/25de4ece8ebdbadf3f19cc45fbaa1fa9/timitaputoseboloxaxixubi.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/20969808906.pdfIn PDF document text
    • http://posuni.com/userfiles/file/migoro.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/22327846982.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/41947519533.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/tewigu.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/3083684707.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/funutobifa.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_off0000b651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB651 16372 bytes
SHA-256: 9a5155946bef690008810f6aa5cf13442ce3422b0b250d0e6bc3bca367eec95e
font_01_sfnt_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 11252 bytes
SHA-256: 0f659712fdf19f74dda3400ada7b88c00158f1f24fbd86ba7838d5769ffcbd35
font_02_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1