Malicious PDF — malware analysis report

Static analysis result for SHA-256 c085a85f8c83c6be…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 17:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c41c8a9fbdaab1a2ff771ba3c17df347 SHA-1: 62fb9cdb79963186ca60943057bbd5947091a20f SHA-256: c085a85f8c83c6be0c50f47934ade7ac17b9511eb4b78d43697216b622965ec0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://laborke.ru/uplcv?utm_term=pope+francis+pentecost+homily
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926f3be115b---70202106713.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d24840d8b9---10422542666.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086088ee37a2---farinipotuxidap.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/kositaropavojibapem.pdf
    • https://faresaldabbous.com/uploads/files/janatumuliwevelazekefu.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/vnql8k8dqp6rt97n95srvn390o/44269576505.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a804a46b4da---58135268976.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39421a97f---gegurodesirivakidewug.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840e9ae00e---golavinadutimofigodadepas.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc7210653---tukosusowajitizefujasi.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607610728203b---23622115081.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076519d391be---51158175035.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/1471eaa923f97209064586f237887f6b/75897728735.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076355167a8a---30806303533.pdf
    • http://delvalle68.com/clients/54584/File/8348792240.pdf
    • http://www.lugashotel.com/data/editorfile/zukufogakodavu.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6be423a97---19062170178.pdf
    • http://dzbnf.com/upload/file///sokawasofi.pdf
    • http://accu-chek-event.com/ckupload/files/9891323251.pdf
    • https://diedacorporation.net/freesiafiles/file/nanerefawegusul.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/6gtnp3rgk8pg3q57fsaic8q4gd/losepu.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa2ef2b2e---kolixemufag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e410.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 16792 bytes
font_01_sfnt_off0000fc22.bin
161b7222631962a269921fdf597be28ef21cf02855c8fd54bd6acf478b8eafed
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 18904 bytes
font_02_sfnt_off00012c25.bin
5b6b4c58cacfc365fb50d2907b7b6e6303741de5705265c81d3302e7c25fd71b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C25 10860 bytes