Malicious PDF — malware analysis report

Static analysis result for SHA-256 131023396d184428…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 23:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa1cd0408227f2dafa68260318435f68 SHA-1: 24ccdc0c69eac7006dae0b58eafadeb9e1ad3cc4 SHA-256: 131023396d184428c63924447fa208eafe1dae1a5a250fb29438efce3bd536f5
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 URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious PDFs. The presence of PDF link farm heuristics suggests the document is designed to redirect users to phishing or malware distribution sites. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=serre+chevalier+ski+map+pdf PDF link annotation
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/sjf48f0ppiiqgkirvotlaqhdkb/tosaputopujavazizujejabin.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160976a3d81e23---riwubomufomejo.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/pufebigererepuji.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b1cd3f8b---furixevawawu.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/rozifokanalukugexumaxa.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/guxap.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607830daeca1e---7141570369.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110677beae3a---95175151679.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/63220618878.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/kebifetamopo.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/12117425111.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3rqla7lrigd7silp5jo0c410e0/nakedav.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/85578258231.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097aacc52e05---62739488308.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/g8v3t0t99n5qv4gnvqqeoi7l2t/10002623847.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062522483570554.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8fd20012---goxumumodarolutumuwabefov.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/18372494377.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9ac82611f---90905943137.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c29b392c---71683551549.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/tunutodosajaje.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/93435653693.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/88988237987.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160775fb8e515f---44005624762.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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 10796 bytes
SHA-256: 8254cb98be9682a343a9ce842b4ca94af333ae35c1169ddb7817308ddbf5e855
font_02_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 19780 bytes
SHA-256: 54169f571bb20de6652ac183dfdaa9dae9fde998b1f05d33546e0fa0f598f377

Open this report in the interactive analyzer, or submit your own file for analysis.