Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1a10d0efbb016c…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 12:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a2fef2bd853f55fb4eb360c6880e5a85 SHA-1: cce2f7122bbe3d7b7868c90e7500d022440de7d5 SHA-256: 9a1a10d0efbb016c5dc57d988cfa51e4b35a97afceb33debd539bed28e50373a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://guapa2.com/admin/fck/file/debogarijefemasaxoxipo.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d54b7e10f2102815b10df423fcb89600/wojorinowanak.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210918181845.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/kogivukimurovixigevera.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/kufosutak.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39478286321.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/49829252447.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/28624355550.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/37477965090.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f13ac32c892650eddccc69e1db5d13ff/71679281535.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/27411263907.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/wexapuli.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/99998130225.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/24161050766.pdfIn PDF document text
    • http://plise.org/userfiles/file/dugegegetudazi.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/44088491400.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0cf26198381ab1d394e78b4aa5d139c0/11874687292.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/56463744992.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/feligazujolawuvulukasode.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/banupijuvota.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/93782602414.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/33288120204.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/46276006683.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd25d03618---29815320002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=spring+batch+retry+examplePDF 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_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 10964 bytes
SHA-256: e015738a8540e99127e88c75f5773fdf2b18baddd3221121f43f8e071c4435f7
font_01_sfnt_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 15752 bytes
SHA-256: b483df1037c6e036adb22c39006ce6b7423dc02c86e18042d27d1830ad2e6d97
font_02_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1