Malicious PDF — malware analysis report

Static analysis result for SHA-256 637d2becc35c9a02…

MALICIOUS

PDF

87.5 KB Created: 2021-08-09 02:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 117a7a5aec6ea7aadc061a13a3b9e89e SHA-1: af09110d380be60e6b8012eaca947c509c6853b2 SHA-256: 637d2becc35c9a0218c0d0ef3edf91b82d9480e0987deed3bc6e45177b34a999
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content, as evidenced by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The presence of these links suggests the document is intended to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=mortal+kombat+x+hacked+apk+download PDF link annotation
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/b364ea3bd6ff004eda95f1484977b87e/bekojimimawedilikiwidadev.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/41969095231.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/65431771215.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6ec53a993---xinalixuguwukomozowokez.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/76898019018.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2b4c15de1---97410731535.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/87946186068.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b4b45f6b46912ad7439d9d3e03cd4850/34325907041.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/kugebusad.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/21813687747.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/gizuvosixixizek.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74b6661f9---55448009790.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/rexazunanij.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/vl3022ld8dvnjodjrkekvd4ogv/pusidemuredeji.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60b068ee7---tofolevejatusiforikogonu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/27/file/36588356686.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/vipera.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/dapijitefepexenuj.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/78f8ad17c882a1cb12e0fc8d5a3333fa/nojipoterutikixobifom.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/16f5ffbc1e183404b6072a3140ca5491/23706433777.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/33749015560.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58da7928c4---xurapijitonalufixokitip.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/90341479874.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/50099709073.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_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 17460 bytes
SHA-256: 5eb32bd909a8727285a079cb95b49e1b1601a03619063d743c6d6c5b6379338d
font_02_sfnt_off000136a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 10932 bytes
SHA-256: 5597e6cfd8cb94683a4ffb2d98ee801741133119bfca45d0d849f830ff3ec5af

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