Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ce1e5d4bd7b8d8…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 11:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b77d79071dcec71e9f7fab0bc611e25d SHA-1: 8a9d078416ebc87dfbb71a16255d2ae3f0647f99 SHA-256: d0ce1e5d4bd7b8d87f6cd7c752cdd0e044fe013c31d473a1985a6ed9c06d449f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded content are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://smidgel.ru/uplcv?utm_term=imunisasi+bias+pdf PDF link annotation
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7fabf1a6644f2b9cd0396112785e9c7d/xujaxubasuzoxajofawun.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ipb90qn0e12j328a62eupnsv4/20973201848.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/31da0e65b8c30feb505579ec2542310b/zerumupakez.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/561078963c9a3a8df53f52ba8ec2381f/87788715063.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/492362de39e729172f45abb7950dceeb/16240427686.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-21/20210721191445492831.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/270038409731.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/6i0f55k9rt63a0tjult3aaa4sh/puxenijosapajiwidu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/nimiwanedoxepo.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/80378765621.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/pixojeta.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/2910134167.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/subawubexugimedip.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8769lk3erl73cep5m45b1gargo/tilafagokaz.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/kenivibabi.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/eb40946178bdeb322f1a9cf3956aab02/27088659222.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab7dbba9b---54588402295.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/lokeb.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/11603612972.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/42714205429.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb52e86cfbb---zuroviropixafutakijixegud.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_off0000cf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 10352 bytes
SHA-256: 270e26ad9cbb32942d204cd3041a38c15ad258086eb901c442628755fc107975
font_01_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 16924 bytes
SHA-256: a40655f915ebc477c78ff65a16522c33ed20cf2748ef9980623f100ebb736379
font_02_sfnt_off00011253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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