Malicious PDF — malware analysis report

Static analysis result for SHA-256 511a86ce631e2087…

MALICIOUS

PDF

88.2 KB Created: 2021-08-10 02:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcd6365e92872d58dbc0a7d1ef0afae9 SHA-1: f7905184bd2f2a2163264f81b91fb5dcbc3672b5 SHA-256: 511a86ce631e20870396886b965c0fff4b6697608008c5cf59308b6aa7ad47e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/rugedi.pdf In PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35350485023.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/koduninamiriponisosar.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/muroduwotowumabuz.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3416c9b2---juwimilobagev.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f098f35fe7a---wijasufe.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/07ac7f6bd735e9c89a8cb99232723610/mewegidudat.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077112789325---joxaxid.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/nejagonuxeker.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/462c233ada707aa699ae023568a37306/nulikofagebofepavanim.pdfIn PDF document text
    • https://questyme.com/userfiles/file/20182699255.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/lvuldt86pto6glptico4dna9a7/82185047886.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/chlmn2emmrho57f4htfnvqeds3/74004611106.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872ca302f54---38965566499.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/43eabtgku3ai9ha5djcb528cqo/naxawatix.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/zekaxorijudunawidadobo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/v23bcdmjbvbqfkjeihmp5e8f9s/kujew.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/98927854244.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vixeditawesaroluxof.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/f0mbkv8utunul13g7op96u6at1/kidewux.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ba9a1f84b3bd81e156d0d577cf4c2367/41266586562.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4ek6tjpebtic9sh10b8goa9ed2/91341035307.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/guzosemafudasimudevut.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160885e78cd423---kamupejosaxuvusisazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+take+print+screen+in+acer+laptopPDF 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_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 17020 bytes
SHA-256: 2e406848fe436c71add731f5bdeb6ae741546ade9c412ae4dfd5cf8ee9911cce
font_01_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 10536 bytes
SHA-256: d10858107acf4316ca7f9ba50dbb8d51c2da3d78d8be8e6b414d16a30c511696
font_02_sfnt_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1