Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8eedee0e52571a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-01 21:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 388a950c5339565ec04ca4c228256ea2 SHA-1: d96868ad18d1e7fae01abcea02dabef3065d831b SHA-256: 4d8eedee0e52571a33b1758eee2532b7777c293097dd8fd782c2ec7ff1ff9ef3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=presidential+executive+orders+by+president PDF link annotation
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608513cf7fb0a---kosowax.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/47040328150.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/13927052744.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a457f913f53---84978562399.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/pejekejedunidevugik.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/kokovamaxovegut.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791df1f2148---55507455818.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4cu187n9bcbp18do6jb44dvlh2/69416896888.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/030116459597.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/75770476926.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4859aa5781---91333052010.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/bqatth6v7pvl3n016doft4s6s9/64828296452.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/c7d8daca692dc7decea6da6a0b87e7cb/zumutijiwiwip.pdfIn PDF document text
    • http://phunhai.net/upload/files/gamoveget.pdfIn PDF document text
    • https://willes-gb.com/uploads//files/202108111611174766.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/wulesakutizezu.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/19616256031.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/4i0mmu38doos2npp83cgsafnk5/zokuwaje.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d370a403c0---vewepepozunuzejebivate.pdfIn PDF document text
    • https://jambumanis.com/contents//files/32602310361.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/gebupilarumumijelokotozi.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/78301094618.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/17964916412.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_off0000b4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CD 11032 bytes
SHA-256: d92bcb71d868d4c76d8aae6080e20ccdec6cbbed07f880bc28c8e9672e9a35ca
font_01_sfnt_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 15392 bytes
SHA-256: 82f7f815f7275ea9e01d176065d2c0445bcf2a5066bc7e36d8b7238d84afdfb0

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