Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07b63e9c4c44234…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 23:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd467578b95a843d5a77543e25ffae99 SHA-1: c4feb55fd2581299992ade174a000be0f0c7eb75 SHA-256: b07b63e9c4c442349b9b97b20660e815c8f00f47f2193b16f7a9a246ea8f6808
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://allytemp.ru/uplcv?utm_term=i+love+you+quotes+in+english PDF link annotation
    • http://sporteambiente.it/ckfinder/userfiles/files/lufanodoluguwikogeteka.pdfIn PDF document text
    • https://tele-video.ru/upload/files/lesogifutu.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/96559520081.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/66684681988.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/goiortul9cc01ir75kfns4ljk7/pefaronipumotukizudawar.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/gudegafonika.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zibilipizijabaduv.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/palewol.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/lasukapusegex.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210908_069F8DC244AD4A09.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/96484941450.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109030627105207.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/69708473132.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/tuwatedefepekadefozijavub.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/nupazutatepaxunezeti.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/pegodo.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/tiwuzoxa.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/77419978892.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9a699fd9.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/lajijebenox.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ede608961d4b726d3bab9806fa8c98b4/jevolevupuz.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/56205074797.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/1593882465.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630478868.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/59691686506.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_off0000cba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 17368 bytes
SHA-256: 919df96cebd5870d122fabd295cfdb01e572406c911dbdab9d0286b97ebfd12e
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 10504 bytes
SHA-256: 20fa726f8516e64c7ab990080ecfa5773262d7c77367bb49d1c024b145f51648
font_02_sfnt_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1