Malicious PDF — malware analysis report

Static analysis result for SHA-256 07271ea9fcaed5eb…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 03:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f4e1fc83d9c8454d1b593846b4fff46 SHA-1: 5adbc498d3b774f6c4f34a7dc86e3156c099b1c4 SHA-256: 07271ea9fcaed5eb43683ac579d3ae4f2394e6880c3fad39d4a0ecbb419f843c
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing confirm the file's nature as a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=erector+spinae+pulled+muscle PDF link annotation
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b69319011dd---rilejinafiruzol.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63a715fce4---dojojowaw.pdfPDF link annotation
    • http://hoangminhceramics.com/app/webroot/uploads/files/votimid.pdfIn PDF document text
    • http://gapp.fr/medias/files/jopiroli.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hk30bimtset214s2ciuqdvkaf4/55245519731.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bbcvgurjgt91gbsd3aj1ii0vt3/58919919552.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c134359bb35bfebeb77ff151a82dc482/92105142320.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/34486361705.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/vubatakawadewuwapome.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/430a3b9a2309b8fa8250910379c182c0/nidikewimekenapag.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/tawebukojavanamuwonitakes.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/34323622239.pdfIn PDF document text
    • https://anakmeong.com/contents//files/99036554996.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af92ae754c9---zazibadalukawawosiz.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/4aaf6d1d264a5039207d4b492a01b6e8/bevubekasiruririkud.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/48262252984.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/41639b13734b3f5b1e7238a1fa081e0e/nesewamenokudi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b439f18965---14260846403.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611c30204c349---daxokuxijafiba.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/8685707788.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608038b446617---rawafopu.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/ziror.pdfIn PDF document text
    • https://bnovum.hu/downloads/46407537915.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/xobibimalemewopu.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_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 10756 bytes
SHA-256: 0454d9b13e9fe039853b35048c7b82ccc07422bb78d413a78cf90a86dcdd9e50
font_01_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 18360 bytes
SHA-256: 964c531ff3594b9959fe4d7a34837912e9681736c2d7c42beaa30c54185c2d04
font_02_sfnt_off00013880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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